Which type of VCO is typically used in Electronic Beepers?

Correct option is C

Electronic beepers require:

Simple circuitry

Audio-frequency oscillation

Low cost and low power

A relaxation oscillator (using RC networks, comparators, or 555 timers) is ideal for this purpose because it:

Easily generates square or pulse waveforms

Operates well in the audio frequency range

Is simple and inexpensive to implement