Which technology should the administrator implement on the connected switch interfaces?

Two 5400R AOS-Switches are OSPF neighbors. The network administrator wants routing to update as quickly as possible in the event of a failure on a neighboring switch.
Which technology should the administrator implement on the connected switch interfaces?
A. MAC Lockdown
B. Unidirectional Link Detection (UDLD)
C. Bidirectional Forwarding Detection (BFD)
D. Spanning Tree Root Guard

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