When running a Linux Virtual Server (LVS) cluster, what is the purpose of a nanny process?

When running a Linux Virtual Server (LVS) cluster, what is the purpose of a nanny process?
A . Each nanny process checks the state of one configured service on one real server, and tells LVS if the service on that real server is malfunctioning.
B . The nanny process powers off a nonfunctional backend server.
C . The nanny process restarts the daemon of a failed service on a real server node.
D . The nanny process changes the IP routing table in the Linux kernel according to the LVS configuration.

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Answer: A