A.f(-x,y)=f(x,y),f(x,-y)=-f(x,y) B.f(-x,y)=f(x,y),f(x,-y)=f(x,y) C.f(-x,y)=-f(x,y),f(x,-y)=-f(x,y) D.f(-x,y)=-f(x,y),f(x,-y)=f(x,y)

A.f(-x,y)=f(x,y),f(x,-y)=-f(x,y) B.f(-x,y)=f(x,y),f(x,-y)=f(x,y) C.f(-x,y)=-f(x,y),f(x,-y)=-f(x,y) D.f(-x,y)=-f(x,y),f(x,-y)=f(x,y)

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