What is the output of below snippet?import java.util.*;public

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What is the output of below snippet?

import java.util.*;
public class Map_Example
{
  public static void main(String[] args)
  {
		Map mapSample = new TreeMap();
		mapSample.put(4, null); 
		mapSample.put(0, null); 
		mapSample.put(3, null); 
		mapSample.put(2, null); 
		mapSample.put(1, null); 
 
       System.out.println(mapSample);
   }
}

1. {0=null, 1=null, 2=null, 3=null, 4=null}
2. Runtime Error
3. Compilation Error
4. {3=null, 0=null, 2=null, 1=null, 4=null}
5. None of these

Correct Option: A

HashMap needs unique keys. TreeMap sorts the keys while storing objects.