Which statement about the MPLS LSP traceroute is true?

Which statement about the MPLS LSP traceroute is true?
A . The destination IP address if an Echo request sent by the LSP traceroute is the IP address of the corresponding FE
C . The downstream mapping TLV is used to carry downstream information of the correct node.
D . Echo request route sends by the LSP traceroute can cay multiple downstream mapping TLVs.
E . The egress route sends back an reply packet containing the downstream mapping TLV if the receives Echo request contains the downstream mapping TL

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Answer: B