2xy Let f(x, y) = 202 + 24 (x, y) + (0, 0) O (x, y) = (0, 0) 1. lim f (x, y) = [ Select ] (x,y) +(0,0) 2. Use the limit definition for partial derivatives to find f. (0, 0). [Select ] 3. f [ Select ] continuous at (0, O). 4. f [ Select ] differentiable at (0, O)