How should an administrator deliver this information?

Northern Trail Outfitters wants to calculate how much revenue has been generated for each of its marketing campaigns.

How should an administrator deliver this information?
A . Design a standard Campaign report and add the value Won Opportunities in Campaign field.
B . Perform periodic data job to update campaign records.
C . Create a roll-up summary field on Opportunity to Campaign.
D . Add a Total Value Field on campaign and use a workflow rule to update the value when an opportunity is won.

Answer: C

Explanation:

Roll-up summary fields allow you to calculate the sum of a field from child records related to a parent record.

Reference: https://help.salesforce.com/s/articleView?id=sf.fields_about_roll_up_summary_fields.htm&type=5