1. For each function below, give an asymptotic upper bound using "big-Oh" notation. Your answer should be as "tight" and "simple" as possible. ajfN)-(1/2) (N log N) + (log N) 2 b)NN (N+N log N+ 1000) cfN)-N log N+2 e-(2N+5+N)/N DN-log:o(2)