Which service type would be used to provide a bi-directional Layer 2 connection of TDM circuits over an IP/MPLS network?

Which service type would be used to provide a bi-directional Layer 2 connection of TDM circuits over an IP/MPLS network?
A . A-pipe
B . E-pipe
C . I-pipe
D . F-pipe
E . C-pipe

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Answer: E