What is the best practice to get the sum of all Order Line item totals on the Order record?

Universal Containers has implemented an order management application. Each Order can have one or more Order Line items. The Order Line object is related to the Order via a master-detail relationship. For each Order Line item, the total price is calculated by multiplying the Order Line item price with the quantity ordered.

What is the best practice to get the sum of all Order Line item totals on the Order record?
A . Roll-up summary field
B . Quick action
C . Apex trigger
D . Formula field

View Answer

Answer: A