类运算符重载实例如下:class CMyPoint{ int x, y; public: CMyPoint(int i, int j){ x=i; y=j; } CMyPoint operator+(CMyPoint &p) //二元运算符 {return CMyPoint(x+p.x, y+p.y);} CMyPoint operator–(CMyPoint &p) //二元运算符 {return CMyPoint(x-p.x, y–p.y);}};p1,p2为该类的实例,则如下调用方法中,错误的是( )

A. CMyPoint p3=p1+p2;
B. operator +(p1,p2);
C. p1=p1.operator +(p2);
D. p1=p1 +(p2);