+The following parameters are available in the `apt` class:
+
+* [`provider`](#provider)
+* [`keyserver`](#keyserver)
+* [`key_options`](#key_options)
+* [`ppa_options`](#ppa_options)
+* [`ppa_package`](#ppa_package)
+* [`backports`](#backports)
+* [`confs`](#confs)
+* [`update`](#update)
+* [`purge`](#purge)
+* [`proxy`](#proxy)
+* [`sources`](#sources)
+* [`keys`](#keys)
+* [`ppas`](#ppas)
+* [`pins`](#pins)
+* [`settings`](#settings)
+* [`manage_auth_conf`](#manage_auth_conf)
+* [`auth_conf_entries`](#auth_conf_entries)
+* [`auth_conf_owner`](#auth_conf_owner)
+* [`root`](#root)
+* [`sources_list`](#sources_list)
+* [`sources_list_d`](#sources_list_d)
+* [`conf_d`](#conf_d)
+* [`preferences`](#preferences)
+* [`preferences_d`](#preferences_d)
+* [`config_files`](#config_files)
+* [`sources_list_force`](#sources_list_force)
+* [`update_defaults`](#update_defaults)
+* [`purge_defaults`](#purge_defaults)
+* [`proxy_defaults`](#proxy_defaults)
+* [`include_defaults`](#include_defaults)
+* [`apt_conf_d`](#apt_conf_d)
+* [`source_key_defaults`](#source_key_defaults)
+
+##### <a name="provider"></a>`provider`