[单选] 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.

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[单选] Which of these statements best describes VPLS?（）

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