Which statement best describes Cisco supervisor engine redundancy using Stateful Switchover?
Select the best response.

A.
Redundancy provides fast supervisor switchover for all Cisco Catalyst 6500 series switches.

B.
Switchover ensures that Layer 2 through Layer 4 traffic is not interrupted.

C.
Switchover can be caused by clock synchronization failure between supervisors.

D.
Redundancy requires BGP, OSPF, EIGRP, or IS-IS.