Which of the following correctly resembles the given state diagram?(a) {ww^r|w=(a+b)*}(b) ε is called the initial stack symbol(c) Both (a) and (b)(d) None of the mentionedI have been asked this question at a job interview.Origin of the question is From PDA to Grammars in chapter Push Down Automata of Automata Theory

Which of the following correctly resembles the given state diagram?(a)

1.	Which of the following correctly resembles the given state diagram?(a) {ww^r\|w=(a+b)*}(b) ε is called the initial stack symbol(c) Both (a) and (b)(d) None of the mentionedI have been asked this question at a job interview.Origin of the question is From PDA to Grammars in chapter Push Down Automata of Automata Theory
Answer» Right option is (a) {ww^r\|W=(a+b)*} For explanation: Initially we put a special symbol ‘#’ into the empty stack. At STATE q1, the w is being read. In state q2, each 0 or 1 is popped when it MATCHES the input. If any other input is given, the PDA will go to a DEAD state. When we REACH that special symbol ‘#’, we go to the accepting state q3.

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