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RPVST+ (Rapid Per VLAN Spanning Tree Plus) is indeed best described by its ability to support rapid transitions and its VLAN-awareness. This protocol is an enhancement of the traditional Spanning Tree Protocol and is designed to minimize the time required for the network to reconfigure after a topology change.

By being VLAN-aware, RPVST+ allows for the creation of a separate spanning tree instance for each VLAN, which ensures that the traffic for each VLAN can be optimized independently. This is a significant improvement over the older Spanning Tree Protocol, which operates on a per-bridge basis without considering VLANs, and allows for faster convergence times when there are changes in the network.

The rapid transitions refer to its ability to quickly recover from link failures and to also enable quicker network topology changes. When a switch port is brought to a forwarding state, RPVST+ can make this decision in less than a second, which vastly improves the performance of the network compared to the original Spanning Tree Protocol.

Thus, the statement that RPVST+ supports rapid transitions and is VLAN-aware accurately captures the key characteristics of this protocol, making it the best choice among the options given.