From an application perspective what should be done prior to performing an SRDF Fallback operation?

From an application perspective what should be done prior to performing an SRDF Fallback operation?
A . Continue accessing the R2 devices
Start accessing the R1 devices before running the command
B . Stop accessing the R2 devices
Run the command and then start accessing the R1 devices
C . Stop accessing the R2 devices
Start accessing the R1 devices before running the command
D . Continue accessing the R2 devices
Run the command and then start accessing the R1 devices

View Answer

Answer: B