Analyze the following code.

public class Test $\{$

int $x$;

public Test$($String $t$

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

$\}$

$\}$

public class Runlt $\{$

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

Test test $=$ null;

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

$\}$

$\}$

The program has a compile error because $x$ has not been initialized.

The program has a compile error because test is not initialized.

The program has a runtime NullPointerException because test is null while executing test.x$.$

The program has a compile error because Test does not have a constructor that has an int parameter.

The program has a compile error because Test does not have a default constructor.