Which of the following statement(s) is/are correct? (a) O(n log n + n2) = O(n2) (b) O(n log n + n2) = O(n2 log 2n) © O(c n2) = O(n2) where c is a constant (d) O(c n2) = O© where c is a constant € O© = O(1) where c is a constant?

(A) Only (a) & (e)
(B) Both (c) and (e)
(C) All of these
(D) Non of these