Which LDP feature must the engineer apply to the existing configuration to eliminate the problem?

Refer to the exhibit.

A network administrator implemented MPLS LDP changes on PE-A LSR device. The engineer must ensure there are no LDP peer are fully operational .

Which LDP feature must the engineer apply to the existing configuration to eliminate the problem?
A . Configure MPLS LDP IGP synchronization on the network.
B . Configure MPLS LDP NSR for all LDP sessions.
C . Enable LDP session protection under the routing protocol.
D . Disable IP CEF on routers LDP and enable

Answer: B

Explanation:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/msp/configuration/xe-3s/mp-ha-xe-3s-book/mp-nsr-ldp-supp.pdf