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Which statements about the edge access layer is true?

Which statements about the edge access layer is true?
A . Using the packet technology it provides a comprehensive transport platform that boasts high reliability, quality of service (QoS) assurance, and large capacity.
B . It implement call control. With the software technology as the core, it completes basic real-time call control and connection control.
C . It connections users to the network by providing various access means, and converts the format of information can be transmitted on the network.
D . It process additional value-added service and operation support for established callas.

Answer: B

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