You need to ensure that all of the email messages sent and received by User1 are accessible to the audit department for 60 days, even if User1 permanently deletes the messages

Your company has an Office 365 subscription.
A user named User1 has a mailbox.
You need to ensure that all of the email messages sent and received by User1 are accessible to the audit department for 60 days, even if User1 permanently
deletes the messages.
What should you do?

A.
Run the Set-MailboxDatabase cmdlet and specify the -deleteditemretention parameter.

B.
Run the Set-Mailbox cmdlet and specify the -litigationholdenabled parameter.

C.
Run the Set-Mailbox cmdlet and specify the -singleitemrecoveryenabled parameter.

D.
Run the Set-MailboxDatabase cmdlet and specify the -eventhistoryretentionperiod parameter.

Explanation: