What is the output of this program?public class Main

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What is the output of this program?

public class Main
    {
        public static void main(String args[])
        { 
             StringBuffer strbuf = new StringBuffer("Interview");
             StringBuffer strbuf0 = new StringBuffer(" Mania");
             strbuf.append(strbuf0);
             System.out.println(strbuf);
        }
    }

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

Correct Option: C

append() method of class StringBuffer is used to concatenate the string representation to the end of invoking string.