Which of following statements is true about IS-IS LDP synchronization?

Which of following statements is true about IS-IS LDP synchronization?
A . LDP establishes a neighbor relationship faster than IS-IS, so LDP synchronization is disabled by default.
B . LDP synchronization can prevent traffic loss during an active/standby link switchover.
C . LDP synchronization can be enabled globally.
D . LDP synchronization can be configured on Loopback interfaces.

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Answer: B