Canon ef or canon rf?

Here is what the site says about that.

From Canon RF: Canon RF: Canon's mirrorless mount, for full-frame bodies and the APS-C ones whose lenses are labelled RF-S. EF and EF-S lenses from Canon DSLRs work fully, autofocus included, through Canon's EF-EOS R adapter. Canon licenses only some third-party autofocus lenses for RF, mostly APS-C ones so far.

From Canon EF: Canon EF: The mount of Canon's DSLRs. EF lenses cover full frame; EF-S lenses are for the APS-C bodies only. A huge used market. Every EF and EF-S lens adapts to Canon RF mirrorless bodies without losing anything.

Quoted from this site's pages.