单选题Spanning Tree Protocol IEEE 802.1 s defines the ability to deploy which of these？（）Aone global STP instance for all VLANsBone STP instance for each VLANCone STP instance per set of VLANsDone STP instance per set of bridges
单选题
Spanning Tree Protocol IEEE 802.1 s defines the ability to deploy which of these？（）
A
one global STP instance for all VLANs
B
one STP instance for each VLAN
C
one STP instance per set of VLANs
D
one STP instance per set of bridges
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