For branch =survivability, what can you suggest for their remote location that has only SIP devices to service?

A customer is asking about the most efficient way to deal with resiliency at remote locations. They have a VMware infrastructure.

For branch =survivability, what can you suggest for their remote location that has only SIP devices to service?
A . Survivable Processor (LSP) tor the location must be on AV
C . The Branch Session Manager (BSM) and the Communication Manager Local Survivable Processor (LSP) for the remote can be installed in their local VMware infrastructure.
D . The branch Session Manager (BSM) can be installed in their VMware infrastructure. The Communication Manager Local Survivable Processor (LSP) for the location must be installed on AV
F . The branch Session Manager (BSM) and the communication Manager local Survivable Processor (LSP) for the location must be installed on an S8300 processor at the location.

Answer: D