You need to restore the membership of Group1

Your network contains an Active Directory forest named contoso.com. The forest contains a
single domain. All domain controllers run Windows Server 2012 R2.
The domain contains two domain controllers. The domain controllers are configured as
shown in the following table.

Active Directory Recycle Bin is enabled.
You discover that a support technician accidentally removed 100 users from an Active
Directory group named Group1 an hour ago.
You need to restore the membership of Group1.
What should you do?

A.
Perform tombstone reanimation.

B.
Export and import data by using Dsamain.

C.
Perform a non-authoritative restore.

D.
Recover the items by using Active Directory Recycle Bin.