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The given Answer is wrong. 

The correct answer should be LDP uses SSO to recover from disruption in control plane service.

"Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) uses SSO, NSF, and graceful restart to allow a Route Processor (RP) to recover from disruption in control plane service (specifically, the LDP component) without losing its MPLS forwarding state."

https://www.cisco.com/c/en/us/td/docs/io...sfsso.html