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Which mode of the Intel timer 8253 provides a software watchdog timer?

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Which mode of the Intel timer 8253 provides a software watchdog timer?

(a) rate generator

(b) hardware triggered strobe

(c) square wave rate generator

(d) software triggered strobe

The question was posed to me during a job interview.

Query is from Timer-II in portion Basic Peripherals of Embedded Systems

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The correct option is (d) software triggered strobe

To elaborate: The software triggered strobe can be used as a software-based watchdog timer in which the output is connected to a non maskable interrupt.

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