$2.$ What will the following Java code output?

$//$ Example $2$

class Parent $\{$

public void display$()\{$

System.out.println$("$Parent class method"$)$;

$\}$

$\}$

class Child extends Parent $\{$

@Override

public void display$()\{$

System.out.println$("$Child class method"$)$;

$\}$

$\}$

public class Main $\{$

public static void main$($String$[]$ args$)\{$

Parent obj;

if $($args$.$length $>0)\{$

obj $=$ new Child$()$;

$\}$ else $\{$

obj $=$ new Parent$()$;

$\}$

obj.display$()$;

$\}$

$\}$

B$)$ Child class method

D$)$ Runtime Error

C$)$ Compilation Error

A$)$ Parent class method