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

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Which two statements about RPVST+ are true? (Choose two.)
A . It automatically enabled uplinkfast and backbonefast
B . It elects one root switch per VLAN instance
C . It supports two STP instances per VLA
E . It is incompatible with spanning tree portfast.
F . Backwards compatibility with 802.1d is not supported.

Answer: AB