Wires that are installed in air returns above a ceiling must be（）

A.Directly to the left and right and slightly in front of the listener
B.Directly to the left and right and slightly behind the listener
C.Above and behind the listener
D.Directly behind the listener

A.the subwoofer is at the wrong angle.
B.the front and rear speakers are reversed.
C.the polarity of the speakers are reversed.
D.the angle of the speakers are incorrect.

A.Unshielded twisted pair
B.RJ-59
C.16/4 solid conductors
D.Speaker Wire