Which two statements about WAN rate-based Ethernet circuits are true?

Which two statements about WAN rate-based Ethernet circuits are true? (Choose two.)
A. The CIR represents the amount of traffic that can pass from a customer to an ISP over the circui
B. Traffic is dropped by the service provider only when it exceeds the configured threshold at the core
C. QoS is performed within the customer core because the service provider is unable to perform rate-limiting
D. QoS is performed at the CE edge to prevent the service provider from dropping excessive traffic
E. The PE device uses VLAN information is used to identify traffic for QoS

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