Refer to the Exhibit.

Your customer would like their four SAN islands (see diagram) connected
so that each fabric can see the devices in the other fabric. The fabrics A, B, C, D need to stay
separate entities. What should be installed to connect the SAN islands?

A.
8 port switch and connect switch A, B, C and D with zones for each switch set

B.
16 port FC switch and connect switch A, B, C and D with zones for each switch set

C.
Two 1620Ms between switch A and B, also switch C and D, then connect the 1620Ms

D.
Two 1620Ms between switch A and B, also switch C and D, then ISL A to C