How could Jon configure DNS servers now that his Security Gateway is in production?

When Jon first installed his new security system, he forgot to configure DNS servers on his
Security Gateway. How could Jon configure DNS servers now that his Security Gateway is in
production?

A.
Login to the SmartDashboard, edit the firewall Gateway object, select the tab Interfaces >
Domain Name Servers.

B.
Login to the firewall using SSH and run cpconfig, then select Domain Name Servers.

C.
Login to the firewall using SSH and run fwm, then select System Configuration > Domain Name
Servers.

D.
Login to the firewall using SSH and run sysconfig, then select Domain Name Servers.

Explanation: