https://api.drupal.org/api/drupal/core%21modules%21views%21src%21Plugin%21views%21row%21RssPluginBase.php/function/RssPluginBase%3A%3AbuildOptionsForm/9
function RssPluginBase::buildOptionsForm | Drupal API
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https://api.drupal.org/api/drupal/core%21modules%21views%21src%21Plugin%21views%21row%21RssPluginBase.php/class/hierarchy/RssPluginBase/8.9.x
RssPluginBase | Drupal API
drupalapi