What feature should the administrator implement?

Dream house Realty has created a custom object to track its Open Houses with a master-detail relationship up to a custom object for Properties. Agents need to quickly calculate the number of Open House records in a status or Pending so they can see the value from the Property record.

What feature should the administrator implement?
A . Lightning Component
B . Formula Fields
C . Roll-Up Summary
D . visualforce Page

Answer: C

Explanation:

A roll-up summary field is used to display a value in a master record based on the values of a set of related detail records. In this case, the administrator can create a roll-up summary field on the Properties object that counts the number of Open House records in a Pending status.

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