Question: Which of the following function headers best fits a type conversion operator to convert an object of the Fraction class to type double, so that

Which of the following function headers best fits a type conversion operator to convert an object of the Fraction class to type double, so that one can use implicit type conversions such as
double root = sqrt Fraction f(1,2);
double operator double(Fraction f) const
double Fraction: operator() const
double convert(Fraction f) const
Fraction: :operator double() const
Which of the following function headers best fits a type conversion

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