Which port must you use?

You are performing initial configuration steps on a MAG Series Junos Pulse Service Gateway
using the serial cable that came with the appliance. You have connected one end of the cable to
the serial port on a PC and you need to connect the other end to the appliance. There are several
ports on the front of the MAG Series chassis.
Which port must you use?

A.
USB port

B.
serial terminal port