Which of these statements best describes VPLS?（）

• A、Neither broadcast nor multicast traffic is ever flooded in VPLS.
• B、Multicast traffic is flooded but broadcast traffic is not flooded in VPLS.
• C、VPLS emulates an Ethernet switch, with eachEMS being analogous to a VLAN.
• D、Because U-PE devices act as IEEE 802.1 devices, the VPLS core must use STP.
• E、When the provider experiences an outage, IP re-routing restores PW connectivity and MAC relearning is needed.