What is the implication of executing the command failover interface-policy 2 on an FWSM?

What is the implication of executing the command failover interface-policy 2 on an FWSM?

A.
The configured failover interface policy will be applied to VLAN 2.

B.
The FWSM will fail over when more than one VU\N interface fails.

C.
The second configured failover interface policy will be applied to the FWSM.

D.
The FWSM will become active when it fails to receive two consecutive heartbeats from the paired FWSM.