Correct option is B
Infrared (IR) remote controls, such as those used for TVs, typically operate at a carrier frequency of 38 kHz. They use Pulse Code Modulation (PCM) to encode the commands sent to the device.
· The carrier frequency of 38 kHz is modulated to carry the data, which consists of a sequence of pulses representing the command.
· PCM is used to encode the data into a series of pulses that the receiving device decodes into commands.
