Let a > 2, a ∈ N be a constant. If there are just 18 positive integers satisfying the inequality (x – a)(x – 2a)(x – a2) < 0 then which of the option(s) is/are correct?
(A) 'a' is composite
(B) 'a' is odd
(C) 'a' is greater than 8
(D) 'a' lies in the interval (3, 11)