After the Isp-ping command is executed, which of the following best describe the router’s action?

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After the Isp-ping command is executed, which of the following best describe the router’s action?
A . MPLS Echo Request packets are sent unlabeled to the prefix 192.10.1.2.
B . MPLS Echo Request packets are sent within the LDP tunnel that are signaled for 192.10.1.2.
C . MPLS Echo Request packets are sent within the RSVP-TE tunnel that are signaled for 192.10.1.2.
D . MPLS Echo Request packets are sent over TC

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Answer: B