单选题Which statement best describes Cisco supervisor engine redundancy using Stateful Switchover？（）ASwitchover ensures that Layer 2 through Layer 4 traffic is not interruptedBRedundancy requires BGP， OSPF， EIGRP， or IS-ISCRedundancy provides fast supervisor switchover for all Cisco Catalyst 6500 series switchesDSwitchover can be caused by clock synchronization failure between supervisors
单选题
Which statement best describes Cisco supervisor engine redundancy using Stateful Switchover？（）
A
Switchover ensures that Layer 2 through Layer 4 traffic is not interrupted
B
Redundancy requires BGP， OSPF， EIGRP， or IS-IS
C
Redundancy provides fast supervisor switchover for all Cisco Catalyst 6500 series switches
D
Switchover can be caused by clock synchronization failure between supervisors
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