Which of the following statement is correct about the C#.NET code snippet given below?

public class Sample
{
    public int x;
    public virtual void fun()
    { }
}
public class DerivedSample : Sample
{
    new public void fun()
    { }
}

    int[][] a = new int[2][];
    a[0] = new int[4]{6, 1, 4, 3};
    a[1] = new int[3]{9, 2, 7}; 
    Console.WriteLine(a[1].GetUpperBound(0));

1. Method
2. Class
3. Assembly
4. Namespace
5. Enum

using System;
namespace CuriousTabConsoleApplication
{
    class MyProgram
    {
        static void Main (string[] args)
        {
            int index; 
            int val = 66; 
            int[] a = new int[5]; 
            try
            {
                Consote.Write("Enter a number: "); 
                index = Convert.ToInt32(Console.ReadLine()); 
                a[index] = val;
            }
            catch(Exception e)
            {
                Console.Write("Exception occurred ");
            }
            Console.Write("Remaining program ");
        }
    }
}

1. Generics is a language feature.
2. We can create a generic class, however, we cannot create a generic interface in C#.NET.
3. Generics delegates are not allowed in C#.NET.
4. Generics are useful in collection classes in .NET framework.
5. None of the above

namespace CuriousTabConsoleApplication
{
    class SampleProgram
    {
        static void Main(string[ ] args)
        {
            int i = 5;
            int j;
            fun1(ref i);
            fun2(out j);
            Console.WriteLine(i + ", " + j);
        }
        static void funl(ref int x)
        {
            x = x * x;
        }
        static void fun2(out int x)
        {
            x = 6; 
            x = x * x; 
        }
    }
}

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
    } 
}

class Sample
{
    public int Length
    {
        get
        {
            return Length;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
        set
        {
            len = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        Readonly get
        {
            return len;
        } 
    } 
}