What is the output of this program?public class output

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What is the output of this program?

public class output
    {
        public static void main(String args[])
        { 
           StringBuffer s1 = new StringBuffer("Interview");
           s1.setCharAt(8,'W');
           System.out.println(s1);
        }
    }

1. Interview
2. Mania
3. Compilation Error
4. IntervieW
5. Runtime Error

Correct Option: D

IntervieW