A customer has four RPAs, two on each site, and total of 100 CGs. They want to change the DNS domain on their RPAs. They want to avoid any disruption to the running CGs with a minimum number of steps. What is the first step of the change?

A.
Change the preferred RPA to RPA1 for all consistency groups.

B.
Install one temporary RPA on each site as box 3 and attach to the cluster.

C.
It is not possible to avoid disruption to CGs.

D.
Detach RPA2 on Site 1 from the cluster, make changes, and reattach to the cluster.