Given the following class declaration,

class Rational
{
public:
Rational();
Rational(int numer, int denom);

int getNumerator() const;
int getDenominator() const;

friend void display(ostream& out, const Rational& value);

friend bool operator(const Rational& left, const Rational& right);
private:
int numerator;
int denominator;
};

what must we add to the class in order for the following code to compile?
Rational myRational(2,3);
if ( 3 < myRational)
a. We need another < operator that expects an integer as the second parameter.
b. We need another < operator that expects an integer as the first parameter.
c. We need a constructor that expects a ration number
d. We need a constructor that expects an integer
e. A or D
f. B or D

f. B or D