1.

Consider the following problem x. Given a Turing machine M over the input alphabet Σ, any state q of M. And a word w Є Σ*, does the computation of M on w visit the state q? Which of the following statements about x is correct?

A. X is decidable
B. X is undecidable but partially decidable
C. X is undecidable and not even partially decidable
D. X is not a decision problem
Answer» B. X is undecidable but partially decidable


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