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Find the open intervals where the function is concave upward or concave downward. Find any inflection points. f(x) = 4x2+3x- 1 Where is the function concave upward and where is it concave downward? Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. O A. The function f is concave downward everywhere. O B. The function f is concave downward on the open interval(s) and the function is concave upward on the open interval(s) (Type your answers in interval notation. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) O C. The function f is concave upward everywhere. O D. The function f is neither concave downward nor concave upward. Find any inflection points of f. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The function f has inflection points at (Simplify your answer. Type an ordered pair. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed. ) O B. The function f has no inflection points