How should the network administrator configure the serial interface of the main office router to make the connection?

A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-cisco router.

How should the network administrator configure the serial interface of the main office router to make the connection?
A . Main (config)#interface serial 0/0
Main (config-if)#ip address 172.16.1.1 255.255.255.252
Main (config-if)#no shut
B . Main (config)#interface serial 0/0
Main (config-if)#ip address 172.16.1.1 255.255.255.252
Main (config-if)#encapsulation ietf
Main (config-if)#no shut
C . Main (config)#interface serial 0/0
Main (config-if)#ip address 172.16.1.1 255.255.255.252
Main (config-if)#encapsulation frame-relay
Main (config-if)#authenication chap
Main (config-if)#no shut
D . Main (config)#interface serial 0/0
Main (config-if)#ip address 172.16.1.1 255.255.255.252
Main (config-if)#encapsulation ppp
Main (config-if)#no shut