Which of the following about inter-AS model A VPRN is FALSE?

It requires the configuration of back-to-back VRFs between ASBR routers in different autonomous systems

It is the most scalable of the Inter-AS models.

Most routers that support VPRN functionality support model A by default.

It uses conventional eBGP to distribute unlabeled IPv4 routes between ASBR routers in different autonomous systems.