When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?

When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?

A.
Set the encapsulation of the interface to HDLC.

B.
Place the CSU/DSU in local-loop mode.

C.
Enable local-loop mode on the DCE Frame Relay router.

D.
Verify that the encapsulation is set to Frame Relay.

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