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? 

Answer options:

A. Host oracle does not have a valid host public key.
B. Host oracle does not have a valid host private key.
C. Host solaris does not have a valid host public key.
D. Host does not have a valid host private key.
E. Host solaris is not configured for host-based authentication.
F. Host oracle is not configured for host-based authentication.
G. Host oracle is not running the ssh service.
H. Host solaris is not running the ssh service.

G

The host he is trying to connect to (oracle) is not running the required service (ssh).