Whichofthefollowingisadiplexerusedfor?()

A.Allowstwosatellitetunerstousethesamedish.

B.Connectsthelownoiseblockdownconverter（LNB）tothemulti-switch.

C.Combinessatelliteandovertheair（OTA）signals.

D.AllowsoneLNBtousetwosatellites.