Which two statements about RPVST+ are true? (Choose two.)
Select all that apply, then click Submit answer.
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It is incompatible with spanning-tree PortFast.
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It supports two STP instances per VLAN.
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It requires approximately 50 seconds to complete reconvergence.
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Backwards compatibility with 802.1d is not supported.
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It elects one root switch per VLAN instance.
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It automatically enables UplinkFast and BackboneFast.