消费争议的解决途径有哪些？

A. 色散补偿不合理，如欠补或过补
B. 入线路纤的光功率过高或过低
C. 发端OTU单板的发送激光器性能劣化
D. 尾线连接头存在严重污染

A. spanning-tree vlan vlan-id primary
B. spanning-tree vlan vlan-id root primary
C. spanning-tree root primary
D. spanning-tree bridge root