Given the Following Class, What Is Syntactically Wrong with the Implementation

Multiple Choice

Given the following class, what is syntactically wrong with the implementation of the display function?
Class Rational
{
Public:
Rational) ;
Rationalint numer, int denom) ;
Rationalint whole) ;
Int getNumerator) ;
Int getDenominator) ;
Friend void displayostream& out, const Rational& value) ;
Private:
Int numerator;
Int denominator;
};
Void displayostream& out, const Rational& value)
{
Out << value.getNumerator) << '/"<<value.getDenominator) ;
}

A) nothing
B) value must be not be pass by reference
C) The get functions are not const functions
D) out should be pass by value