Which of the following statement about the MPLS-TP OAM level is correct?
A . Section is the service layer of the tunnel, Tunnel is the service layer of the PW, and PW is the service layer of the Service.
B . Section is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Service.
C . Service is the service layer of the PW, PW is the service layer of the Tunnel, and Tunnel is the service layer of the Section.
D . Tunnel is the service layer of PW, PW is the service layer of Service, and Service is the service layer of Section.
Answer: A