In keepalived, what is configured by the configuration option sorry_server?

A.
The addresses of backend servers that were overloaded in the past and should be scheduled with a reduced priority.

B.
The hostnames of the servers that, despite the remaining configuration, should always be scheduled by the Serial Operation Round Robin algorithm.

C.
The addresses of backend servers that should not get assigned any new connections.

D.
The default virtual host that is assigned to incoming HTTP requests missing a Host: header before forwarding them to a backend server.

E.
The address of a server to which requests are redirected in case no real server is available.