What are the five functions of sales management?

The correct answer is option D
Since the intern is not allowed to view Opportunities, but needs to see the most recent Closed Date of all child Opportunities when viewing an account record, a developer can create a roll – up summary on the account that performs a MAX on the Opportunity Close Date field.

A roll – up summary that performs a MAX displays the highest value of the field selected in the Field to Aggregate option for all directly related records. Only numbers, percent, date, currency, and date/time are available.
Hope this helps.