Of the four types of SONET transmission equipment, what performs the 3R (Refresh/ Re-amplify,
Reshape, Retime) function?

A.
Path Terminating Equipment

B.
SONET Terminating Equipment

C.
Regenerator

D.
Add/Drop Multiplexer

E.
Digital Cross-Connect System

F.
Line Multiplexing Equipment

G.
Post/PreAmplifier