Refer&ensp;to&ensp;the&ensp;exhibit.&

Refer to the exhibit. Which statement describes DLCI 17？（）

ADLCI 17 describes the ISDN circuit between R2 and R3.
BDLCI 17 describes a PVC on R2. It cannot be used on R3 or R1.
CDLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3.
DDLCI 17 describes the dial-up circuit from R2 and R3 to the service provider.

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