What are two features of 6RD IPv6 transition mechanism?

It inserts IPv4 bits into an IPv6 delegated prefix.

It uses a native IPv6-routed network between CE routers and the BR router.

It allows dynamic 1:N translation of IPv6 address.

It uses stateful automatic 6to4 tunnels between CE routers and the BR router.

It uses stateless automatic 6to4 tunnels between CE routers and the BR router.