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.

Explanation:
Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for
sending data over synchronous serial links using HDLC.
Cisco HDLC is the default encapsulation type for the serial interfaces.