The correct answer is A. Flow.
The requirement is to automatically update a field on the Asset record when a related maintenance Work Order is closed. This is a record-change automation requirement. A record-triggered Flow can run when a Work Order is updated, check whether it is a maintenance work order and closed, and then update the related Asset's last maintenance date.
Salesforce Flow supports updating related records through the Update Records element in record-triggered flows.
C . Roll-up Summary is not the best answer because Salesforce roll-up summary fields require a master-detail relationship, and the Work Order's Asset field is a lookup relationship to Asset.
B is incorrect because Einstein Next Best Action recommends actions; it does not maintain roll-up style data.
D is incorrect because Apex Trigger is unnecessary when Flow can meet the requirement declaratively.

The correct answer is D.
Managers need to create child Accounts directly from a parent Account and auto-populate fields from that parent record. This is an object-specific custom action use case. Salesforce Trailhead states that object-specific actions can create records that have automatic relationships to other records and provide a streamlined experience across desktop and mobile. Salesforce also documents that predefined field values can be used with quick actions to set field values automatically, improving consistency and speed.
A . Global Quick Action is not ideal because it does not run in the specific parent Account context. B. Path does not create child records. C. Custom link is not the recommended Lightning approach for creating related records with predefined values.

The correct answer is C. Create a Partial Copy Sandbox and use a sandbox template.
A Partial Copy Sandbox includes metadata plus selected production data and supports the use of a sandbox template to control which objects and data are copied. This allows the app builder to exclude confidential custom objects. It also meets the weekly refresh requirement because Salesforce allows Partial Copy sandboxes to be refreshed every 5 days.
B . Full Copy Sandbox can use a sandbox template, but it does not meet the weekly refresh requirement.
A and D are incorrect because Developer and Developer Pro sandboxes are not the correct choice when the sandbox must include selected production data records through a sandbox template.

The correct formula is TEXT(Galaxy__r.Type__c).
The parent field Type__c is a picklist. In Salesforce formulas, a picklist value cannot be displayed directly as plain text unless it is converted with the TEXT() function. Salesforce documentation states that TEXT() converts picklist values to text in supported formula contexts. Cross-object formulas can reference fields from related parent records, so the child object Star__c can reference the parent Galaxy__c field using the relationship syntax Galaxy__r.Type__c.
VALUE() is for converting numeric text into a number, ISPICKVAL() checks whether a picklist equals a specific value, and FIND() searches text. None of those displays the parent picklist value as text.

The correct answer is C. A delegated approver is the recommended Salesforce feature when the assigned approver is unavailable, such as during vacation. Salesforce documentation confirms that users can identify a delegate in approval settings, and delegated approvers can approve or reject approval requests.
This ensures the closed-won Opportunity can still be reviewed before the leaderboard is updated, even though the owner's manager is away.
Why others are incorrect:
A is not the best recommended setup because relying on an assistant to reassign requests is manual and reactive.
B is incorrect because forwarding approval requests is not the standard solution for planned approver absence.
D is incorrect because assignment rules do not assign delegated approvers for approval processes.