Additional options for this link.
This is merged (\Drupal\Component\Utility\NestedArray::mergeDeep()) with \Drupal\Core\Menu\MenuLinkInterface::getOptions(), to allow menu link tree manipulators to add or override link options.
public $options = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkTreeElement.php/property/MenuLinkTreeElement::options/8.1.x