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Which of the following is not a stage of a state machine?

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Which of the following is not a stage of a state machine?

(a) Waiting for instantiation

(b) Waiting for timer

(c) Fetching the waveform

(d) Waiting for response

I got this question in an interview for job.

This question is from Software Architecture Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Right option is (b) Waiting for timer

To explain: A state machine is any device that stores a status for a given time. The status may change according to the input. Waiting for instantiation, fetching the waveform, and waiting for response are the three stages of a state machine. Conditions for switching from one state to another are a part of the state machine.

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