Given the following MPLS configuration to enable frame-mode MPLS over ATM:
interface atm 0/0.2 point-to-point
pvc auto
ip unnumbered loopback 0
tag-switching ip
Which command is using incorrect syntax?

A.
pvc auto

B.
tag-switching ip

C.
ip unnumbered loopback 0

D.
interface atm 0/0.2 point-to-point