Which of the following functions from to R are in the class O(ns) ( big- oh ) . Note that big-Oh is just an upper bound, not a lower bound on the complexity! Of(n) = 4" Of(m) = 500n Of(m) = 2n4 - 13 Of(n) = P(n,n) where P refers to the number of permutations Of(m)= 10on3 +500m2 Of(n ) = 2n2 Of(m)= P(2,n) where P refers to the number of permutations Of(m) = n(n + 4)(3n -1) 6