Find the intervals on which the function f(x)=x^4-8x^2+16 is increasing an decreasing. identify the function's local extreme values. if any, saying where they are taken on. which, if any, of the extreme values are absolute? choose the correct answer reguardimg intervals that are increasing and decreasinga. the function f is increasing on the subintervals (-\infty,-2],[0,2] and decreasing on the subintervals [-2,0],[2,\infty)b the function f is increasing on the subintervals (-\infty,-2],[2,\infty)and decreasing on the subintervals [-2,0],[0,2]c. the function f is decreasing on the subintervals (\infty,-2],[2,\infty)and increasing on the subintervals [-2,0],[0,2].d. the function f is decreasing on the subintervals (-\infty,-2],[0,2] an increasing on the subintervals [-2,0],[2,\infty)