Определение разделов классов друзей и аксессуаров

When defining a class as a friend class, does it matter in which accessor section the definitions is placed, and if so does that change the members the friend has access to?

class aclass
{
private:
   // friend bclass;

public:
   // friend bclass;

protected:
   // friend bclass;
};

class bclass
{};