Find all critical points of the following function. f(x,y) = -8xy-2x^4-2y^4 What are the critical points? Select the correct choice below and if necessary, fill in the answer box within your choice. A. The critical point(s) is/are (0,0),(1,- 1),(-1,1) (Type an ordered pair. Use a comma to separate answers as needei) B. There are no critical points.
