We wish to build the simplest possible automaton for L = {xcx : x is in (a+b)+ }. Note there are two copies of x separated by a special center symbol 'c', e.g., "baacbaa". What is the simplest automaton for deciding L? OA. We can decide L using only an NFA. OB. We can decide L using a deterministic PDA. OC. We need at least a nondeterministic PDA for deciding L. OD. We need at least a Turing machine for deciding L.

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