(1 point) NOTE: When using interval notation in WeBWorK, remember that: You use 'INF' for o0 and '-INF' for oo. And use 'U' for the union symbol. Enter DNE if an answer does not exist. a: for) = 2 a: + 16:1: + 60 a) Give the domain of f (in interval notation) b) Find the critical numbers of f. (Separate multiple answers by commas.) 0) Determine the intervals on which 3' is increasing and decreasing. f is increasing on: and f is decreasing on: , , and d) Use the First Derivative Test to determine whether each critical point is a local maximum, minimum, or neither. Local maxima occur at a: : (Separate multiple answers by commas.) Local minima occur at a: : (Separate multiple answers by commas.)