An app builder has a custom component they want to make available on the utility...

The correct answer is D. For use on the utility bar.

For a custom Lightning web component to appear as an available component in the utility bar, it must be exposed in its metadata configuration with the lightning__UtilityBar target. Salesforce developer documentation states that lightning__UtilityBar enables a component to be used as a utility item in an app’s utility bar, and the component must be exposed with the appropriate target.

B. For use in Lightning App Builder is broader and not enough by itself for utility-bar availability. C. For use on record pages exposes the component for record pages, not the utility bar. A. For use in App Manager is not the correct component target wording.

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