Find all the critical numbers of f(x)=x3+3x-1, then determine the local minimum and maximum points by using a graph. a.) Critical number: x = -2 (-2,3) is a local maximum. b.) Critical numbers: x = - 23 and x = 0 2 59 is a local maximum, and (0, -1) is a local minimum. 3' 27 c.) Critical numbers: x = -2 and x = 0 (-2,3) is a local maximum and (0, -1) is a local minimum. d.) Critical number: x = 0 (-2,3) is a local maximum, and (0, -1) is a local minimum.