(1 point) Answer the following questions for the function defined on the interval [-15.71,3.13]. f(x)=si sin Remember that you can enter pi for 7 as part of your answer. a.) f(x) is concave down on the region(s) (-15pi/4, -5pi b.) A global minimum for this function occurs at 0 c.) A local maximum for this function which is not a global maximum occurs at 3.13 d.) The function is increasing on the region(s) (-15.71, 3.13)U(0, 3.13] 3.13 0 correct 3.13 correct [-15.71,3.13) U (0,3.13] [-15.71,3.13) U (0,3.13] incorrect Your union contains overlapping in