单选题Which statement about VPLS is true？（）AAll CE devices emulate a bridgeBAll provider devices emulate a bridgeCHierarchical VPLS reduces signaling overheadDEach PE device emulates a bridgeEEach CE device emulates a bridge
单选题
Which statement about VPLS is true？（）
A
All CE devices emulate a bridge
B
All provider devices emulate a bridge
C
Hierarchical VPLS reduces signaling overhead
D
Each PE device emulates a bridge
E
Each CE device emulates a bridge
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