What is the output of this program?import java.util.*;

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What is the output of this program?

import java.util.*;
   public class Map_Example 
    {
        public static void main(String args[]) 
        {
            HashMap object = new HashMap();
            object.put("D", new Integer(4));
            object.put("E", new Integer(5));
            object.put("F", new Integer(6));
            System.out.println(object.keySet());
        }
    }

1. {D=4, E=5, F=6}
2. [D, E, F]
3. [D, E, F] 3
4. [D=4, E=5, F=6]
5. None of these

Correct Option: B

keySet() method returns a set containing all the keys used in the invoking map. Here keys are characters D, E & F. 4, 5, 6 are the values given to these keys.