Correct option is C
In a 555 timer IC, the Control pin (Pin 5) is used to directly control the voltage at which the internal comparator operates. By applying a variable voltage to the Control pin, the duty cycle of the output waveform can be modulated, making the 555 IC work as a pulse width modulator (PWM).
· The Control pin allows external adjustment of the threshold and trigger voltages, enabling fine control over the output pulse width.
