Which of the following statement is correct about the program given below?

#include<iostream.h> 
struct Tab
{
    short n;
};
int main()
{
    Tab b;
    Tab& rb = b;
    b.n = 5;
    cout << b.n << " " << rb.n << " ";
    rb.n = 8;
    cout << b.n << " " << rb.n;
    return 0; 
}

#include <iostream.h> 
enum xyz 
{
    a, b, c
}; 
int main()
{
    int x = a, y = b, z = c; 
    int &p = x, &q = y, &r = z; 
    p = z; 
    p = ++q;
    q = ++p;
    z = ++q + p++; 
    cout<< p << " " << q << " " << z;
    return 0; 
}

#include<iostream.h>
#include<process.h> 
class CuriousTab
{
    static int x; 
    public:
    CuriousTab()
    {
        if(x == 1)
            exit(0); 
        else
            x++;
    }
    void Display()
    {
        cout<< x << " ";
    }
};
int CuriousTab::x = 0; 
int main()
{
    CuriousTab objCuriousTab1; 
    objCuriousTab1.Display(); 
    CuriousTab objCuriousTab2; 
    objCuriousTab2.Display(); 
    return 0; 
}

#include<iostream.h> 
class India
{
    public:
    struct CuriousTab
    {
        int   x;
        float y;
        void Function(void)
        {
            y = x = (x = 4*4); 
            y = --y * y;
        }
        void Display()
        {
            cout<< y << endl;
        } 
    }B; 
}I; 
int main()
{
    I.B.Display(); 
    return 0;
}

1. Once the variable and the reference are linked they are tied together.
2. Once the reference of a variable is declared another reference of that variable is not allowed.