The diagram at the left represents a collection of level sets for a certain function, where the outer-most level is at the lowest height. Point A is ? a relative maximum a relative minimum a saddle point not a critical point Point B is ? a relative maximum a relative minimum a saddle point not a critical point Point C is ? a relative maximum a relative minimum a saddle point not a critical point Point D is ? a relative maximum a relative minimum a saddle point not a critical point

In order to get credit for this problem all answers must be correct.