Let f(x.y) be a two variable function with fy = y and fy =x. What are the extreme points of f with constraint 4x² + y2 = 8? O a. (1,-2). (-1,-2), (-2, 2). (-1,-1) O b.(1,-2), (1,2), (-1, 2). (-1,-2) O C. (1,2), (1, -2), (2,1), (2,-1) O d.(1,1), (1,-1), (2.2), (2.-2)

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