What is the problem?

User jack on host solaris attempts to use ssh to log in to host oracle and receives this
message: jack@solaris:~$ ssh oracle ssh: connect to host oracle port 22: connection

refused What is the problem?

A.
Host oracle is not configured for host-based authentication.

B.
Host solaris is not configured for host-based authentication.

C.
Host oracle is not running the ssh service.

D.
Host solaris does not have a valid host public key.

E.
Host oracle does not have a valid host public key.

F.
Host oracle does not have a valid host private key.

G.
Host does not have a valid host private key.