Let fle, y) = e . Use the Second Partials Test to determine which of the following is true. a) fle, y) has a saddle point at (0, 0). o bj f (e, y ) does not have a critical point at (0, 0). o c) fey) has a relative minimum at (0, 0). o d) flo, y ) has a relative maximum at (0, 0)