Refer to the exhibit.

Server A and Server B are running two different applications on SRDF R1 devices on the Source Symmetrix. All the R1 devices belong to the same RDF group. Both applications are replicated with SRDF/S.
A disaster has occurred at the source site.
What step is needed to restart the applications at the remote site?

A.
Execute SRDF failback for all the devices in the RDF group

B.
Execute SRDF failover for all the devices in the RDF group

C.
Shut down Server A and B and then execute SRDF failback for all the devices in the RDF group

D.
Halt the applications on Server A and B and then execute SRDF failover for all the devices in the RDF group