Which of these statements best describes VPLS？（）
A. Neither broadcast nor multicast traffic is ever flooded in VPL
B. Multicast traffic is flooded but broadcast traffic is not flooded in VPL
C. VPLS emulates an Ethernet switch， with each EMS being analogous to a VLA
D. Because U-PE devices act as IEEE 802.1 devices， the VPLS core must use ST
E. When the provider experiences an outage， IP re-routing restores PW connectivity and MAC re-learning is needed.
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