Et (x+1yl, (x, y) + (0, 0) fx, y)= 0, x, y)= (0, 0) hen, ja fx, y) is continuous at origin (b) fx, y) is discontinuous at origin (c) fx, y) is differentiable at

et (x+1yl, (x, y) + (0, 0) fx, y)= 0, x, y)= (0, 0) hen, Ja fx, y) is continuous at origin (b) fx, y) is discontinuous at origin (C) fx, y) is differentiable at origin dfx, y) is not differentiable at origin