which feature of a VMAX 40K increases performance and makes the virtual fabric more fault tolerant?

When compared to a VMAX 20K, which feature of a VMAX 40K increases performance and
makes the virtual fabric more fault tolerant?

A.
An additional pair of Matrix Interface Board Enclosures (MIBE)

B.
Redundant Star Topology

C.
Eight additional VMAX engines

D.
Additional interconnects to the dual Matrix Interface Board Enclosures (MIBE)