Implementing Cisco IP Switched Networks (SWITCH v2-0) (#69)

Which two statements about RPVST+ are true? (Choose two.)

It is incompatible with spanning-tree PortFast.
It supports two STP instances per VLAN.
It requires approximately 50 seconds to complete reconvergence.
Backwards compatibility with 802.1d is not supported.
It elects one root switch per VLAN instance.
It automatically enables UplinkFast and BackboneFast.