Refer to the exhibit.

The routing switches shown in the exhibit run OSPF on the links between each other. The commander in the Switch-1 VSF fabric goes down. Traffic is disrupted for several seconds.
What should a network administrator do to support a faster failover in a similar situation?
Select an option, then click Submit answer.
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Configure echo mode BFD on the VLAN that connects Switch-1 and Switch-2.
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Add VRRP on the VLAN between Switch-1 and Switch-2.
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Configure graceful restart, or nonstop OSPF, on Switch-1 and Switch-2, with a proper timer.
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Create a redundant virtual link between Switch-1 and Switch-2.