Question from the Drupal 8 test

$node = node_load($nid);

$node = entity_load('node', $id);

$node = $this->entityManager->getStorage('node')->load($nid);

$node = \Drupal::entityTypeManager()->getStorage('node')->load($id);

$entity_manager = \Drupal::entityTypeManager();
$node = $entity_manager->getStorage('node')->load($nid);

$node = \Drupal\node\Entity\Node::load(217);