about lim f(x, y)? (x,y)-(0.0) Using the two-path test, lim (xy)-(0,0) f(x, y) = 1. lim f(x, y) exists. (xy)-(0.0) D This option This option Using the two-path test, lim f(x, y) = 0. (x,y)-(0,0) lim f(x, y) doesn't exist. (ху)- (0,0)

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