Which tool should an app builder use to implement this?

Cloud Kicks wants to display the number of opportunities that are Closed Won with a Close Date within the last year on the Account detail page.

Which tool should an app builder use to implement this?
A . Process Builder
B . Activity Timeline
C . Roll-Up Summary Field
D . Workflow Rule

Answer: C

Explanation:

A roll-up summary field is a field that calculates values from related records. A roll-up summary field can be used to display the number of opportunities that are closed won with a close date within the last year on the account detail page by using a filter criteria on the field.