Xy fx, y)= when (x, y) # (0, 0), f0, 0) = 0 x+y at (0, 0), then (a) t is continuous (b) f process partial derivatives (c) fis not continuous (d) f is not differ

xy fx, y)= when (x, y) # (0, 0), f0, 0) = 0 x+y at (0, 0), then (a) t is ContinuOus (b) f process partial derivatives (c) fis not continuous (d) f is not differentiable