Question 1 1 pts Consider the function f(x,y) = ax~ + bxy + cy~ + dx + ey + f, where a, b, c, d, e, and f are parameters. If 4ac - b- > 0 and a > 0, then O the function f is strictly convex. O the function f is strictly concave. O the function f is neither concave nor convex. O There is not enough information to determine if the function is concave, convex, or neither