Which two are true about the use of RMAN recovery catalogs when offloading backups to...

The physical standby database may be used to register the database in the recovery catalog, if the primary is not registered.

Itbackups that are offloaded to a physical standby database are taken when not connected to a recovery catalog, then they may still be used for restoration on the primary database.

The primary and physical standby databases must be registered separately in the recovery catalog, if a far sync instance is used to route redo to the physical standby database.

Primary and physical standby databases may use different virtual recovery catalogs in the same physical recovery catalog.

It is not necessary to use a recovery catalog unless a far sync instance is used to route redo to the physical standby database.