Identify the true functions from the following. Multiple select question.
a) n⁵ is O(n⁷).
b) (log2 n)⁷ is O(n⁸).
c) n⁴ is O(n³).
d) 3n is O(n¹00).
e) n⁸ is O(3n).
f) n⁸ is O((log2 n)⁹).