Analyze the following code and choose the best answer:

public class Foo $\{$

private int $x$;

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

Foo foo $=$ new Foo$()$;

System.out.println$($foo$.$x$)$;

$\}$

$\}$

a$.$ You cannot create a self$-$referenced object; that is$,$ foo is created inside the class Foo.

b$.$ Since $x$ is defined in the class Foo, it can be accessed by any method inside the class without using an object. You can write the code to acciess $x$ without creating an object such as foo in this code.

c$.$ Since $x$ is private, it cannot be accessed from an object foo.

d$.$ Since $x$ is an instance variable, it cannot be directly used inside a main method. However, it can be accessed through an object such as foo in this code.