You need to prevent User1 from permanently deleting ite…

Your company is investigating a user named User1.
You need to prevent User1 from permanently deleting items from his mailbox.
What should you run?

A.
Set-Mailbox User1 LitigationHoldEnabled $true.

B.
Set-Mailbox User1 ModerationEnabled $true.

C.
Set-Mailbox User1 RetainDeletedltemsUntilBackup $true.

D.
Set-Mailbox User1 RetentionHoldEnabled $true.