Which one of the following is not a part of testing of sequential circuits?

Which one of the following is not a part of testing of sequential circuits? Correct Answer Defining voltage levels at input or output

Testing of sequential circuits is generally more difficult than testing combinational circuits. If the flip-flop outputs can be observed, then the state table can be verified directly on a row-by-row basis. But defining the voltage levels is not an operation to be done during testing. It should be defined earlier.

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