When configuring surround sound systems， speaker delay is used to compensate for speaker（）.

A.Contains four pair of wires of various gauge
B.Contains two wires in a red fireproof jacket
C.Contains four twisted pairs of wires
D.Contains eight wires within a thick jacket with a rip cord

A.multi-room audio， telephone， intercom and temperature control.
B.thermostat， CCTV， smoke detectors and keypads.
C.home theater， lighting control and multi-room audio.
D.video， digital cable， and satellite applications.

A.100BaseT Ethernet
B.802.11g
C.Z-Wave
D.Bluetooth