8. What is the purpose of state c of the state diagram of the previous question?

  1. To remember that the most previous input was a 1.
  2. To remember that the most previous input was a 0.
  3. To remember that the two most previous inputs were 01.
  4. To remember that the two most previous inputs were 00.
  5. To remember that the three most previous inputs were 001.

4 is CORRECT. State c is entered anytime X = 00.

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