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Which of the following statements about the MPLS-TP OAM level is correct?  

Which of the following statements about the MPLS-TP OAM level is correct?  
A . Section is the service layer of Tunnel, Tunnel is the service layer of PW, and PW is the service layer of 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 PW, PW is the service layer of Tunnel, and Tunnel is the service layer of 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

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