Suppose we have a function where (1,4)\displaystyle {\left({1},{4}\right)} is a critical point, D(1,4)<0\displaystyle {D}{\left({1},{4}\right)}<{0}, and fxx(1,4)>0\displaystyle {{f}_{{{x}{x}}}{\left({1},{4}\right)}}>{0}. What kind of point does f\displaystyle {f} have at (1,4)\displaystyle {\left({1},{4}\right)}?