Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?

Question:
Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?

• PVST+
• 802.1D
• MST
• Rapid PVST

Explanation: MST is the Cisco implementation of MSTP, an IEEE standard protocol that provides up to 16 instances of RSTP. PVST+ provides a separate 802.1D spanning-tree instance for each VLAN that is configured in the network. 802.1D is the original STP standard defined by the IEEE and allows for only one root bridge for all VLANs. 802.1w, or RSTP, provides faster convergence but still uses only one STP instance for all VLANs.

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