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Que. Which of the following are not regular?

(A) Strings of even number of a’s.
(B) Strings of a’s, whose length is a prime number.
(C) Set of all palindromes made up of a’s and b’s.
(D) Strings of a’s whose length is a perfect square.
a. (A) and (B) only
b. (A), (B) and (C) only
c. (B), (C) and (D) only
d. (B) and (D) only
Answer:(B), (C) and (D) only

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