Given the following program

public class CarTest $\{$

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

$\}$

System.out.println$("$Car Test"$)$;

$\}$

which statement is true?

The file for this program may have a name "Test.java".

The file for this program must be named "CarTest.java".

The program can be stored in any file with $".$java" extension.

The file for this program must be named "CarTest.class".