Why is it recommended to have at least one backup proxy server in each site when defining a replica job?

Why is it recommended to have at least one backup proxy server in each site when defining a replica job?
A. The proxies allow for no VM snapshots during transit.
B. The proxies allow replication automatic restart after failure.
C. The proxies allow data compression during data transit across the WAN.
D. The proxies allow automatic WAN acceleration.

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