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The factors of x^3-1+y^3+3x y are (a) (...

The factors of `x^3-1+y^3+3x y` are
(a) `(x-1+y)(x^2+1+y^2+x+y-x y)`
(b)`(x+y+1)(x^2+y^2+1-x y-x-y)`
(c)`(x-1+y)(x^2-1-y^2+x+y+x y)`
(d)`3(x+y-1)(x^2+y^2-1)`

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