What about the following SSID planning is not achievable in the WLAN Enterprise Network?

What about the following SSID planning is not achievable in the WLAN Enterprise Network?
A . Plan dedicated SSIDs for employees, using high-security 802.1x authentication
B . The same SSID, while providing 802.1x authentication for the staff to provide visitors with Portal authentication
C . Plan Guest SSID for visitors, using MAC + Portal authentication
D . The SSID of Enterprise-Init is used as the authentication domain

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Answer: B