Salesforce Platform Developer I (legacy) — Question 188

A developer working on a time management application wants to make total hours for each timecard available to application users. A timecard entry has a Master-
Detail relationship to a timecard.
Which approach should the developer use to accomplish this declaratively?

Answer options

• A. A Visualforce page that calculates the total number of hours for a timecard and displays it on the page
• B. A Roll-Up Summary field on the Timecard Object that calculates the total hours from timecard entries for that timecard
• C. A Process Builder process that updates a field on the timecard when a timecard entry is created
• D. An Apex trigger that uses an Aggregate Query to calculate the hours for a given timecard and stores it in a custom field

Correct answer: B

Explanation

The correct answer is B because a Roll-Up Summary field is specifically designed to aggregate data from related records in a Master-Detail relationship, making it the most efficient way to calculate total hours from timecard entries. Option A requires manual calculations and displays, which is less efficient. Option C uses Process Builder, which is not as direct for this purpose, and option D involves Apex coding, which is not a declarative solution.