Which three statements regarding VSTP are correct?
VSTP maintains one independent spanning-tree instance for every enabled VLAN, permitting different VLANs to use different paths. Its BPDUs are VLAN-tagged, so distinct BPDUs are transmitted for the respective VSTP VLANs. On platforms using the non-ELS implementation reflected by the 253-instance limit, VSTP supports up to 253 VLANs/topologies. VSTP can be configured concurrently with RSTP and is not enabled by default.
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