What is the correct statement of floowing options()?

What is the correct statement of floowing options()?

(Select 3 Answers)
A . A wireless local area network(LAN) can be divided into several sub-network which require different authentication by SSID Technology.Each sub-network needs independent of the authentication.Only authenticated users can enter the corresponding subnet, to prevent unauthorized users to access the network..
B . Actually, BSSID is MAC address of the AP, which used to identify the AP management of BS
C . BSSID and SSID are one-to-one mapping within the same A
E . The user can implement roaming under different SSI
G . In one ESS, the SSID are the same, but each AP with the matching BSSID in one ESS is not the same.If one AP can support many SSID, then AP can distribute different BSSID to correspond these SSI

Answer: A B D