Which of the following operations on some built-in Python list lst will mutate the list (assume that i and j are valid indices)?

(a) lst + lst

(b) lst.extend(x)

(c) lst.index(x, i, j)

(d) lst * 7

Which of the following relations is not, strictly speaking, true?

(a) 3n + 2 = O(n)

(b) 2n 3 + 10n 5 = O(n 3 )

(c) 10n n 2 = O(n 2 )

(d) 5 log2 n = O(2n )