Please show handwritten steps

x2 + 1 10. Determine the intervals on which the graph of the function f(x) =2 7 2 - 4 is concave upward and concave downward. 10 A. The function f is concave upward on the intervals (-co, -2) and (2, ) and downward in the interval (-2, 2) B. The function f is concave down ward on the intervals (-co, -2) and (2, ) and upward in the interval (-2, 2) C. The function f is concave upward on the intervals (-2, ) and downward in the interval (2 , 00 ) D. Concave upward throughout the domain