Refer to the exhibit. An engineer began to configure LDP between R1 and R2, but R1 and R2 cannot yet establish an LDP TCP connection. Which additional task must be completed to finish the implementation?
A. Configure the mpls ldp neighbor 10.0.12.1 password command on R1
B. Configure the mpls ldp neighbor 172.16.0.1 password command on R1
C. Configure the no mpls ldp password option 1 command on R1
D. Configure the no mpls ldp password option 1 command on R2
