which statement is true in this operational metaSAN?

In the exhibit,

which statement is true in this operational metaSAN?

A.
Edge Fabric A and B must have the same FID.

B.
The link between FC Router 1 and 2 must use a VEX_Port.

C.
The link between FC Router 1 and Edge Fabric B must be an ISL.

D.
FC Router 1 and 2 must have the same FID.