Salesforce Certified Platform App Builder 1-10

For organization-wide sharing settings, you can choose one of Private, Public Read Only, or Public Read/Write for an object.
When set to Private or Public Read Only, you can grant users additional access through the role hierarchy or by defining sharing rules.
Because access propagates vertically in the role hierarchy, users assigned to a higher role can access records owned by, or shared with, lower roles.
In this scenario, the requirement is that the higher-level SC wants to view, edit, and delete records owned by the lower-level technicians, so B is correct.
Organization-Wide Sharing Settings
Controlling Access Using Hierarchies

As a premise, a “customer” is an external user outside your company’s email domain.
When the “Allow Customer Invitations” setting is enabled, users can invite customers to private groups that they own or manage.
An invited customer can only interact with the members of the group they were invited to, and access to other groups or content is restricted, so D is correct.
Customer Invitations

To restrict visibility of the [Jupiter] field on the [Solar System] object to only users with the [Outer Planets] profile, use field-level security.
Field-level security is a feature that can control access to fields based on a user’s profile, so C is correct.

Choose the appropriate type of sandbox based on the required storage capacity, copy settings, and refresh frequency.
The Developer Pro Sandbox is the one that can be refreshed at an interval of 3 days or less and can hold at least 0.5 GB of data, so C is correct.
The Developer Sandbox has a short refresh interval, but its storage capacity is limited to 200 MB, so it cannot meet the requirement.
Sandbox Licenses and Storage Limits by Type

The key point of this question is that it succeeded in the full copy sandbox but failed only in production.
Because a full copy sandbox has almost the same configuration as production, differences like A, B, and C would normally occur the same way in both environments.
On the other hand, when a package contains Apex code, there are cases where the referenced objects differ between environments, or the [Author Apex] permission required to run the tests is missing in production, so D is correct.
Troubleshooting AppExchange Package Installation Failures

A validation rule is a feature that lets an administrator define criteria for data entry or import and display an error message when the criteria are not met.
The conditions under which an error should be shown in this question are: (1) a user who does not have a marketing role, (2) the [Retail Opt In] picklist field, and (3) is updated to [Yes].
Expressed as a formula, this becomes the combination where $UserRole.Name != ‘Marketing’ narrows down the target users, ISCHANGED(Retail_Opt_In__c) determines that the value has changed, and ISPICKVAL(Retail_Opt_In__c, “Yes”) determines that the new value is “Yes”, so C is correct.

The relationship between Asset and Asset Inventory is 1 (Asset) : N (Asset Inventory).
If all you want is to display child object records as a related list on the parent’s page layout, creating a lookup relationship is the best practice, so C is correct.
A master-detail relationship imposes stronger constraints between the objects and adds unnecessary complexity, so it is inappropriate.
A junction object is an approach that uses two master-detail relationships to express a many-to-many relationship, which does not fit this question’s one-to-many requirement.

AppExchange is a Salesforce-authorized marketplace where you can obtain solutions that package specific functionality.
Because a ready-made solution such as a Lightning component that supports stock-price display already exists, installing it without incurring development cost is the optimal choice, so B is correct.
Stock Market Updates Lightning Component
What Is AppExchange

Salesforce has a campaign feature that lets you manage marketing initiatives in connection with sales activities.
By configuring campaign hierarchy and campaign statistics, you can visualize and analyze which initiatives led to which opportunities being won, so C is correct.
Salesforce Campaigns Overview

The Import Wizard supports duplicate checking only for standard objects and specific rules, and handles up to 50,000 records, but it does not support duplicate rules on custom objects.
The Data Loader can import up to 5 million records and also supports duplicate rules defined on custom objects, so C is correct.
The Lightning Object Creator is a tool that creates new custom objects from a spreadsheet, and Schema Builder is a tool that displays and modifies the structure of objects and fields, so both are inappropriate.