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.