假定复数类MyComplex声明如下：有MyComplexX(，)，Y(，)，Z(，);则对表达式X+Y;以及XZ;理解正确的是（）AX.operator+(Y);X.operator(Z);Boperator+(X，Y);operator(X，Z);CX.operator+(Y);operator(X，Z);Doperator+(X，Y);X.operator(Z);