Which command can the system administrator use on the server to see if the connection request is getting to the server?

Given:
server IP address = 192.168.123.254
client IP address = 192.168.123.21
A user reports an inability to connect to a remote server through ssh.
Which command can the system administrator use on the server to see if the connection request
is getting to the server?

A.
inetadm -v 192.168.123.21

B.
snoop 192.168.123.254 and dst ssh

C.
snoop src 192.168.123.21 and port 22

D.
netstat -rn