Regarding the way SAC equipment accesses the network, which of the following descriptions are correct? (Multiple Choice)

Regarding the way SAC equipment accesses the network, which of the following descriptions are correct? (Multiple Choice)
A . SACG equipment is required to communicate with the terminal at Layer 2.
B. The SACG is usually side-mounted on the core switch device and uses policy routing to divert traffic.
C. SACG supports side-hanging on non-Huawei devices.
D. SACG devices are required to communicate with the Agile Controller at Layer 2.

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Answer: BC