Consider the function f (a) =. In this question you will find the critical points of f (x) . a) What is the domain of f (a)? [ Select ] b) Find the derivative f' (x). [ Select ] c) Where is the derivative O? f' (x).= 0 at [Select ] d) Where is the derivative undefined? f' (x) - DNE at [ Select ] e) The critical points of f (x) are: [ Select ]