4 Find all points (x,y) where f(x,y) has a possible relative maximum or minimum. Then use the second derivative test to determine, if possible, the nature of f(x,y) at each of these points. If the second derivative test is inconclusive, so state. f ( x,y ) = x - yz - 12x+ By Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The point(s) where f(x,y) has a possible relative maximum or minimum is/are (Type an ordered pair Use a comma to separate answers as needed.) O B. There is no possible relative maximum or minimum Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The point(s) at which f(x,y) has a relative maximum is/are (Type an ordered pair Use a comma to separate answers as needed.) O B. There is no relative maximum. Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. The point(s) at which f(x,y) has a relative minimum is/are (Type an ordered pair. Use a comma to separate answers as needed.) O B. There is no relative minimum Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. The point(s) at which f(x,y) has neither a relative maximum nor a relative minimum is/are (Type an ordered pair. Use a comma to separate answers as needed) O B. There is always a relative maximum or a relative minimum Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. The point(s) at which the second derivative test is inconclusive is/are (Type an ordered pair. Use a comma to separate answers as needed.) O B. There is no point where the second derivative test is inconclusive leted of. P Pea Click to select and enter your answer(s) ucati Per Next