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A push down automaton employs ________ data structure.

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A push down automaton employs ________ data structure.

(a) Queue

(b) Linked List

(c) Hash Table

(d) Stack

The question was posed to me by my school teacher while I was bunking the class.

My doubt is from PDA-Acceptance by Final State in portion Push Down Automata of Automata Theory

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The correct option is (d) Stack

The explanation is: A push down automata uses a stack to carry out its operations. They are more capable than the finite automatons but less than the turing model.

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