Which description of the main purpose of the LDP targeted Session is true?

Which description of the main purpose of the LDP targeted Session is true?
A . To improve the label convergence time for directly connected LSRs by maintaining the session up when the link between LSRs by maintaining the session up when the link between LSRs down
B . To prevent traffic from being black-holed by building a MPLS forwarding table depending on the IP routing protocol in use
C . To establish an adjancency before exchanging network information to avoid keepalive messages being dropped during heay network traffic event
D . To provide the means for LSR to request and release label prefix binding information to peers routers

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Answer: A