Which configuration achieves this goal?

Refer to the exhibit. XR2 needs to have LDP configured with PE1. Which configuration achieves this
goal?

A.
interface giga 0/0
Mpls ip
exit
commit

B.
router ospf 1
mpls ldp auto config area 0
exit

commit

C.
router ospf 1
area 0 mpls ldp auto config
exit
commit

D.
interface giga 0/1
mpls ldp
exit
commit