3 Find all the critical numbers of f(X) = 3X44X3+3X2+2, then determine the local minimum and maximum points by using a graph. Critical numbers: X = - 1, X = 0, X =1 (0.2) is a local and global minimum. Critical number: X =1 There is no local maximum or local minimum. Critical numbers: X = -1 and X =1 There is no local maximum or local minimum. Critical numbers: X = 0 and X =1 (0.2) is a local minimum