According to EMC best practices, what is the minimum number of subnets and IPs required?

You are configuring a single engine VPLEX Metro to support both local and distributed volumes. The VPLEX will utilize 10Gb WAN-COM modules in a routed configuration.

According to EMC best practices, what is the minimum number of subnets and IPs required?
A . 7 subnets; 15 IPs
B . 5 subnets; 15 IPs
C . 3 subnets; 7 IPs
D . 3 subnets; 30 IPs

Answer: A