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Which among the following is incorrect for o-machines?

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Which among the following is incorrect for o-machines?

(a) Oracle Turing machines

(b) Can be used to study decision problems

(c) Visualizes Turing machine with a black box which is able to decide cerain decion problems in one operation

(d) None of the mentioned

I had been asked this question in an online quiz.

The query is from The Language of Turing Machine topic in portion Introduction to Turing Machines of Automata Theory

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Best answer
The correct choice is (d) None of the mentioned

The best explanation: In automata theory, an o- machine or oracle machine is a abstract machine used to study decision problems. The problem the oracle solves can be of any complexity class. Even undecidable problems like halting problems can be used.

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