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How can a monostable multivibrator using IC 555 be used as a PWM generator?

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How can a monostable multivibrator using IC 555 be used as a PWM generator?

(a) If a diode is connected across the resistor RA

(b) If a modulating signal m(t) is applied at the control pin

(c) If the control pin is always kept high

(d) It cannot be used as a PWM generator ever

I had been asked this question in an internship interview.

Question is taken from Different Types of Multivibrators topic in portion Multivibrators of Analog Circuits

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Right option is (c) If the control pin is always kept high

The explanation: A monostable multivibrator can be used as a PWM generator if a modulating signal is applied to the control pin. The control pin is used to vary the voltage at the inverting node of the upper comparator. If unused, then the control pin is grounded through a capacitor.

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