To check which function is not bounded by O(n^2)
option 1,4 are exponent functions and can never be bounded by n^2 for large inputs
option 2 n^1.98 is bounded by n^2
option 3 n^3/sqrt(n) ==> n^2.5 is also not bounded by n^2
So option 1,3,4 are not bounded whereas option 2 is bounded.
Am I right?