Question: Which of the following are non regular?

Options

A : The set of strings in {a,b}* with an even number of b's

B : The set of strings in {a, b, c}* where there is no c anywhere to the left of a

C : The set of strings in {0, 1}* that encode, in binary, an integer w that is a multiple of 3. Interpret the empty strings e as the number 0.

D : None of the mentioned

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