Which the following VC ID configurations are correct?

Exhibit:

As shown in the figure, one enterprise has VPN A, the other has VPN B, and the two VPNs each have two CEs. The following requirements needs to be met.

VPNA-CA 1 can interwork with VPNA-CE 2

2>VPNA-CE 1 can interwork with VPNA-CE 2.

The figure shows the types of links between CEs and PEs and the IDs used in Martini mode .

Which the following VC ID configurations are correct?
A . VCID1 =1, VCID2 = 2, VCID3 =3, VCID4 +4
B . VCID1 =2, VCID2 = 2, VCID3 =2, VCID4 +2
C . VCID1 =1, VCID2 = 2, VCID3 =1, VCID4 +2
D . VCID1 =1, VCID2 = 1, VCID3 =2, VCID4 +2

Answer: A