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 TreeSet_Example 
    {
        public static void main(String args[]) 
        { 
            TreeSet object = new TreeSet();
            object.add("7");
            object.add("0");
            object.add("9");
            object.add("5");
            object.add("6"); 
            System.out.println(object);
        }
    }

1. Runtime Error
2. Compilation Error
3. [0, 5, 6, 7, 9]
4. [6, 7, 9]
5. [0, 5, 6, 7]

Correct Option: C

TreeSet class uses set to store the values added by function add in ascending order using tree for storage