When certifying a CAT5 cable installation the integrator must perform which of the following tests？（）

A.loud， bass intensive music （e.g. heavy metal， rock）.
B.providing a sub-woofer for great bass reproduction.
C.background music and blending in with decor.
D.the user who wants perfect sound reproduction.

A.Black，Green，Red，Yellow
B.Black，Red，Green，Yellow
C.Red，Black，Green，Yellow
D.Yellow，Red，Green，Black

A.The sensor itself
B.The way the zones are wired
C.The zone type
D.The digital dialer