Which three of the following statements are true about a smart jack? (Choose three)

Which three of the following statements are true about a smart jack? (Choose three)
A . It provides signal conversion.
B . It operates at Layer 2 of the OSI model.
C . It regenerates the signal to compensate for signal degradation from line transmission.
D . It provides loopback testing.
E . It acts as a concentration point for dial-in and dial-out connections.

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Answer: A,C,D