What are the advantages of creating the approver as a group instead of a user?

You are configuring an approval task in a template. There is only one approver for the task.

What are the advantages of creating the approver as a group instead of a user? There are 2 correct answers to this question.
A . Future-proofing: You may want to have multiple approvers in the future.
B . Ease of administration: It is easier to add/remove users to or from groups than it is to change the task.
C . Delegation: Users cannot delegate approval tasks to others unless they are in the same group.
D . Notifications: You can only configure the notifications for groups, not for users.

Answer: A,B