AW Computing needs to capture a loss reason in a rich text field when an opportunity is closed lost.

AW Computing needs to capture a loss reason in a rich text field when an opportunity is closed lost.
A . How should an administrator configure this requirement?
B . Create a validation rule to display an error if stage is closed lost and Loss Reason is blank.
C . Select the required checkbox next to the Loss Reason field on the page layout.
D . Check the required checkbox on the Loss Reason field in Object Manager.
E . Configure a workflow rule to display an error if Loss Reason is blank.

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Answer: A