Which is the best solution?

A customer environment has the following configuration:

100 separately-managed application servers
active/standby high availability
requirement for 10,000 SSL TPS

The customer is looking to migrate to Cisco ACE solely for the features of SLB and SSL. Which is the best solution?

A.
two Cisco ACE appliances

B.
a single Cisco ACE module

C.
tour Cisco ACE Appliances

D.
two Cisco ACE modules