单项选择题

A.It is a label distribution protocol for MPLSB.It is a……

Which of the following is true regarding Label Distribution Protocol （LDP）？（）

A.It is a label distribution protocol for MPLS
B.It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network
C.Tag distribution Protocol （TDP） was the basis for LDP
D.All of the above are true

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