Challenge #1 of 3

Q: 

Suppose we have a basic controller that extends Symfony\Bundle\FrameworkBundle\Controller\AbstractController. In it, there's an action that renders a template:

class PizzaController extends AbstractController
{
    #[Route('/pizza/order')]
    public function orderPizza()
    {
        return $this->render('pizza/order.html.twig');
    }
}

In this case, what does $this->render() return?