L OSTIMTECH

What is the output of the following C# code?

using System;

class Mainclass $\{$

static void Main$($string$[]$ args$)\{$

Senior senior$=$ new Senior$()$;

Student student $=$ senior;

student.study$()$;

$\}$

$\}$

class Student $\{$

public Student$()\{$

Console.Write$("1")$;

$\}$

public void study$()\{$

Console.Write$("2")$;

$\}$

$\}$

class Senior:Student $\{$

public Senior$()\{$

Console. Write$("3")$;

$\}$

public void study$()\{$

Console.Write$("4")$;

$\}$

$\}$