What can an admin do to meet this requirement?

The sales team has requested that a new field be added to accounts called Current Customer. The default value will be No and will change "Yes" if any related opportunity is successfully closed as won.

What can an admin do to meet this requirement?
A . Configure current customer as a roll-up summary field that will recalculate whenever an opportunity is won
B . Use an Apex trigger on the Account object that sets the Current customer field when an opportunity is won.
C . Use a workflow rule on the Opportunity object that sets the current customer filed an opportunity is won.
D . Configure current customer as a text field and use an approval process to recalculate its value

Answer: B