R1# show interface pos1/0/0 POS1/0/0 is up, line protocol is up Hardware is Packet over Sonet Description: ATM Keepalive set (10 sec) Scramble disabled LMI enq sent 123412, LMI stat recevd 123414, LMI upd recevd 0, DTE LMI up Broadcast queue 0/256, broadcast sent/dropped 234523/0, interface broadcasts 2345233 Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters never 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 23412 bits/sec, 50 packets/sec

Which WAN protocol is being used pos1/0/0 ?

A.	ATM
B.	HDLC
C.	PPP
D.	Frame Relay