You need to ensure that all of the email messages sent …

Your company has an Office 365 subscription.
A user named Test5 has a mailbox. You need to ensure that all of the email messages sent and received by Test5 are accessible to members of the audit
department for 60 days, even if Test5 permanently deletes the messages.
What should you do?

A.
Run the Set-User cmdlet.

B.
Run the Set-Mailbox cmdlet.

C.
Run the Set-RetentionPolicyTag cmdlet.

D.
Run the Set-MailboxDatabase cmdlet.

E.
Run the Set-RetentionPolicy cmdlet.