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Which mode of 8253 can provide pulse width modulation?

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Which mode of 8253 can provide pulse width modulation?

(a) programmable one-shot

(b) square wave rate generator

(c) software triggered strobe

(d) hardware triggered strobe

This question was posed to me during an internship interview.

This interesting question is from Timer topic in portion Basic Peripherals of Embedded Systems

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The correct option is (a) programmable one-shot

Explanation: Mode 1 of the Intel 8253 can provide pulse width modulation for the power control where the gate is connected to a zero crossing detector or a clock source.

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