If f(x) =2-3x2. From first principles select the correct step. O a. lim f (x - c) - f(x) O b. (2 -3(x + h) 2) - (2-3x2) lim h O C. f (2 - 3(x + h)?) - f(2 -3x2) lim h O d. lim (2 -3(x) -2) -f(x) h+0 h