(A) Rational_number operator+( Rational_number & obj);
(B) Rational_number operator+(double& obj);
(C) Rational_number operator+(Rational_number &obj, double& num);
(D) operator+(double& obj);
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(A) Rational_number operator+( Rational_number & obj);
(B) Rational_number operator+(double& obj);
(C) Rational_number operator+(Rational_number &obj, double& num);
(D) operator+(double& obj);