Below is the function f(x). 6- 4 3 2 1 -7-6-5-4-3-2-1 12 3 4 6 -1 пр * -5- -6 Over which interval of a values is f'> 0? ○ (3,∞) ○ [3,∞) 0(-0,3) 0 (-0,3] 0 (-00,00] Over which interval of a values is f'< 0? ○ (3,∞) ○ [3,∞) O(-∞,3) 0 (-0,3] 0 (-00,00] Over the interval (-∞, ∞), this function is concave up (f">0) concave down (f" < 0)