Based on the output displayed which statement is correct?

Refer to the exhibit.

The show interfaces serial 0/1 command was issued on the R10-1 router.

Based on the output displayed which statement is correct?
A . The cable connected to the serial 0/1 interface of the R10-1 router is a DTE cable.
B . The R10-1 router can ping the router interface connected to the serial 0/1 interface.
C . The clock rate used for interface serial 0/1 of the R10-1 router is 1,544,000 bits per second.
D . The CSU used with the serial 0/1 interface of the R10-1 router has lost connection to the service provider.
E . The interface of the remote router connected to the serial 0/1 interface of the R10-1 router is using the default serial interface encapsulation.

Answer: E

Explanation:

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for Cisco HDLC is the default encapsulation type for the serial interfaces.