Which option should be used?

After performing a failover to a disaster recovery site, it is decided that the VMs need to be failed back to the original production site and that any changes made during the failover should be discarded.

Which option should be used?
A . Undo failover
B . Undo failback
C . Failback
D . Commit failback

Answer: A

Explanation:

https://helpcenter.veeam.com/docs/backup/vsphere/undo_failover.html?ver=120