Re: Inheritance & scope - correct addressing

I have a quite old code to reactivate (still), and ran into the
following problem:
(This is a boild down ecample that doesn't do anything, i just want to
state the problem)

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template <class T , int N>
class Rec: public Rec<T,N-1>
{
public:
 Rec(T i):Rec<T,N-1>(i){};
 inline void access(T newt)
 {
   base_var=newt; // ERROR "not in scope"
   //this->base_var=newt;
   //Rec<T,1>::base_var=newt;
   //Rec<T,N-1>::base_var=newt;
 }

};

template <class T>
class Rec<T,1>
{
public:
 Rec(T i){ base_var=i;};
protected:
 T base_var;
};

int main(void)
{
 Rec<int,3> int_vec(0);
 int_vec.access(5);
 return 0;
};
----------------------------------------------------------------------------------------------------------
Now my question.
Which of the three options would be "correct"

   //this->base_var=newt;
   //Rec<T,1>::base_var=newt;
   //Rec<T,N-1>::base_var=newt;

and what is the difference? is there any?