How many active zone sets may exist on an MDS-Series switch?

A.
Only two zone sets are permitted: one for the default VSAN and one for the primary
VSAN

B.
One zone set is permitted for each VSAN, except the isolated VSAN

C.
Only one zone set is permitted for the entire switch

D.
Only three zone sets are permitted: one for the default VSAN, one for the isolated
VSAN, and one for the primary VSAN