Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）

• A、 Channel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.
• B、 Channel-associated signaling utilizes a separate TDM channel for transmitting control signals.
• C、 Common channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.
• D、 Common channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice.
• E、 ISDN BRIs implement channel-associated signaling.