Refer to the exhibit.

Which statement describes DLCI 17?

A.
DLCI 17 describes the ISDN circuit between R2 and R3.

B.
DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1.

C.
DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3.

D.
DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider.