In the following code, which line should be changed so it outputs the number 2:class...

In the following code, which line should be changed so it outputs the number 2:

class A {

protected $x = array(); /* A */

public function getX() { /* B */

return $this->x; /* C */

}

}

$a = new A(); /* D */

array_push($a->getX(), "one");

array_push($a->getX(), "two");

echo count($a->getX());