Which task must be performed first to Implement BFD in an IS-IS environment?

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Which task must be performed first to Implement BFD in an IS-IS environment?
A . Disable Cisco Express Forward.ng on all interfaces running routing protocols other than IS-IS
B . Configure BFD under the IS-IS process
C . Configure all ISIS routers as Level 2 devices
D . Configure BFD in an interface configuration mode

Answer: B