How many fault-tolerant groups will the customer require if it splits its active contexts evenly between both Cisco ACE Modules?

A customer of yours has decided to configure two Cisco ACE Modules in a high-availability solution. This customer has six contexts configured and has decided to use the active-active model. How many fault-tolerant groups will the customer require if it splits its active contexts evenly between both Cisco ACE Modules?

A.
4

B.
2

C.
8

D.
6