Which statement about MPLS LDP router ID is true?

Which statement about MPLS LDP router ID is true?
A . The force keyword changes the router ID to the specific address causing any impact.
B . The loopback with the highest IP address is selected as the router I
D . If not configured, the operational physical interface is chosen as the router ID even if a loopback is configured.
E . If MPLS LDP router ID must match the IGP router I

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Answer: B