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What is the correct way to overload the '+' operator for a class as a member function?

Integer operator+(const Integer&);

const Integer operator+(const Integer&) const;

The operator+ should be overloaded as a const member function as it prevents modification of the current object's state. Option A is incorrect as the first parameter of an overloaded operator+ should be a reference to an object of the same class. Option C is incorrect as static member functions cannot be called on objects. Option D is incorrect as it returns a reference to an integer, whereas the operator+ should return the modified object. Therefore, option B is the correct way to overload the '+' operator for a class as a const member function.

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static Integer operator+(const Integer&);

Integer& operator+(const Integer&) const;

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