If the expression \( a x^{3}+2 x^{2} y-b x y^{2}-2 y^{3} \) is symmetric, then \( (a, b)= \) (a)...

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If the expression \( a x^{3}+2 x^{2} y-b x y^{2}-2 y^{3} \) is symmetric, then \( (a, b)= \)
(a) \( (2,2) \)
(b) \( (-2,2) \)
(c) \( (-2,-2) \)
(d) \( (2,-2) \)
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