Which statements are true regarding ISDN channels?（）A、Each B channel can transmit up to 64 kbpsB、The ISDN B channel carries voice or dataC、The ISDN D channel transmits control information.D、The D channel transmission rate varies depending on the service used.E、HDLC or PPP can be used to encapsulate D channel information.
Which statements are true regarding ISDN channels?（）
- A、Each B channel can transmit up to 64 kbps
- B、The ISDN B channel carries voice or data
- C、The ISDN D channel transmits control information.
- D、The D channel transmission rate varies depending on the service used.
- E、HDLC or PPP can be used to encapsulate D channel information.
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