MODULATION IS REQUIRED FORSelect one:a. ALL OF THE ABOVEb. MULTIPLEXING THE SIGNALSc. REDUCING NOISE WHILE TRANSMISSIONd. REDUCTION OF ANTENNA HEIGHTe. REDUCTION IN THE COMPLEXITY OF CIRCUITRY

The correct answer is a. ALL OF THE ABOVE.

Modulation is a process that changes the characteristics of a carrier signal according to the information signal. It is required for:

b. Multiplexing the signals: Modulation allows multiple signals to be transmitted simultaneously over a single channel, increasing the efficiency of the medium.

c. Reducing noise during transmission: Modulation can improve the signal-to-noise ratio and quality of the signal in a noisy channel.

d. Reduction of antenna height: Without modulation, the size of the antenna needed for transmission would be extremely large as it is directly proportional to the wavelength of the signal.

e. Reduction in the complexity of circuitry: Modulation can simplify the design of the transmitter and receiver and reduce the cost and complexity of the circuitry.