Q. What will be the output of the following Java program?
package pkg;
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello");
s1.setCharAt(1, x);
System.out.println(s1);
}
}

• (A) xello
• (B) xxxxx
• (C) Hxllo
• (D) Hexlo