Which statements about roaming are TRUE? (Multiple Choice)

Which statements about roaming are TRUE? (Multiple Choice)
A . STA roaming indicates the process in which STAs switch from one AP to another.
B . In both Layer 2 and Layer 3 roaming, STAs* IP addresses remain unchanged.
C . The APs used to implement WLAN roaming must be of the same model.
D . When an AC receives an association/re-association request, it determines that the STA roams if an entry about the STA already exists.

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Answer: ABD