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The symbol Z0 in formal definition of PDA is used for

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Let LD  be the set of all languages accepted by a PDA by final state and LF  the set of all languages accepted by empty stack. Which of the following is true?

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Which of the following languages over {a,b,c} is accepted by a deterministic pushdown automata?\a. {wcwR ? w? {a,b}* } b. {wwR ? w? {a,b,c}* }c. {anbncn ? n ? 0 } d. {w ? w is a palindrome over {a,b,c} } Note: wR  is the string obtained by reversing 'w'
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A push down automata is different than finite automata by
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4.
Consider the NPDA ?Q = {q0, q1, q2}, ? = {0, 1}, ? = {0, 1, ?}, ?, q0, ?, F = {q2}?, where (as per usual convention) Q is the set of states, ? is the input alphabet, ? is stack alphabet, ? is the state transition function, q0 is the initial state, ? is the initial stack symbol, and F is the set of accepting states, The state transition is as following
Which one of the following sequences must follow the string 101100 so that the overall string is accepted by the automaton? 
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5.
The instantaneous description is PDA shows
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