What should you create first?

You have an exchange server 2016 organization. The organization contains a Mailbox server

named EX01. EX01 contains a mailbox database named DB01. The volume that contains DB01
fails. You need to perform a dial-tone recovery of the database. What should you create first?

A.
a new Recovery Storage Group

B.
a new mailbox database

C.
a mailbox move request

D.
a mailbox restore request

E.
a lagged database copy