Which of the following statements are correct about exception handling in C#.NET?

1. If our program does not catch an exception then the .NET CLR catches it.
2. It is possible to create user-defined exceptions.
3. All types of exceptions can be caught using the Exception class.
4. CLRExceptions is the base class for all exception classes.
5. For every try block there must be a corresponding finally block.

1. int a;
   String res; 
   if (a % 2 == 0)
       res = "Even"; 
   else 
       res = "Odd";

2. int a; 
   String res; 
   if (a Mod 2 == 0) 
       res = "Even"; 
   else
       res = "Odd";

3. int a;
   Console.WriteLine(a Mod 2 == 0? "Even": "Odd");

4. int a; 
   String res;
   a % 2 == 0? res = "Even" : res = "Odd";
   Console.WriteLine(res);

int a = 10, b = 20, c = 30; 
int res = a < b? a < c? c : a : b; 
Console.WriteLine(res);

int i = 0, j = 0; 

label:
    i++;
    j+=i;
if (i < 10)
{
    Console.Write(i +" ");
    goto label; 
}