The input used by an antenna or cable to a TV set uses frequencies called:

The correct answer is: B. RF

RF stands for radio frequency. It is a frequency range of electromagnetic radiation that is used for radio communication. The frequencies used for RF range from 3 kHz to 300 GHz.

The input used by an antenna or cable to a TV set uses frequencies called RF. These frequencies are used to transmit the TV signal from the antenna or cable to the TV set. The TV set then converts the RF signal into a video and audio signal that can be displayed on the TV screen and heard through the TV speakers.

The other options are incorrect.

• IF stands for intermediate frequency. It is a frequency that is used in radio receivers to amplify and filter the incoming signal before it is demodulated.
• AF stands for audio frequency. It is a frequency range of sound waves that is audible to humans. The frequencies used for AF range from 20 Hz to 20 kHz.
• SAP stands for secondary audio program. It is a second audio signal that is transmitted along with the main audio signal. SAP is often used to provide audio in a different language or to provide closed captioning.