单选题Which of the following is true regarding Label Distribution Protocol （LDP）？（）AIt is a label distribution protocol for MPLSBIt is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a networkCTag distribution Protocol （TDP） was the basis for LDPDAll of the above are true
单选题
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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