1.

Consider the transition diagram of a PDA given below with input alphabet ∑ = {a, b} and stack alphabet Γ = {X, Z}. Z is the initial stack symbol. Let L denote the language accepted by the PDA.Which one of the following is TRUE?

A. L = { an bn |n ≥ 0} and is not accepted by any finite automata
B. L = { an | n ≥ 0} ∪ { anbn | n ≥ 0} and is not accepted by any deterministic PDA
C. L is not accepted by any Turing machine that halts on every input
D. L = { an|n ≥ 0} ∪ {anbn|n ≥ 0} and is deterministic context-free
Answer» E.


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