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Which of the following automata takes queue as an auxiliary storage?

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Which of the following automata takes queue as an auxiliary storage?

(a) Finite automata

(b) Push down automata

(c) Turing machine

(d) All of the mentioned

The question was asked in an international level competition.

Asked question is from PDA-acceptance by Empty Stack topic in division Push Down Automata of Automata Theory

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Best answer
Right option is (c) Turing machine

Explanation: Pushdown Automaton uses stack as an auxiliary storage for its operations. Turing machines use Queue for the same.

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