In a certain MPLS network, the LSP information of R1 and R3 is shown in the figure. At this time, the administrator enters the command ping -a 10.1.12.13.3.3.3 on R1. Which of the following descriptions of this scenario is correct?
A . The Echo Request message received by R2 carries label 1025, and the Echo Reply message received by R2 carries label 1024.
B . The Echo Request message received by R2 does not carry a label, and the Echo Reply message received by R2 carries label 1024
C . The Echo Request message received by R2 carries label 1025, while the Echo Reply message received by R2 does not carry a label.
D . The Echo Request message received by R2 does not carry a label, and the Echo Reply message received by R2 does not carry a label either.
Answer: A
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