How many licenses, of which type, would be required for their environment?

A customer has three VMAX arrays and one VNX array fronted by an EMC VPLEX. They want to use RecoverPoint to protect their environment.

How many licenses, of which type, would be required for their environment?
A . 1 EX license only
B . 4 EX licenses
C . 5 EX licenses
D . 1 SE license and 1 EX license

Answer: A