In the Company wireless LAN， what is the function of the Service Set Identifier （SSID）？（）
A、 The SSID must match on both the Company client and the Company access point and provides MAC Address Authentication to authenticate the client to the access point.
B、 The SSID should be configured on the Company client site only and provides data-privacy functions and authentication to the access point.
C、 The SSID must match on both the Company client and the Company access point and provides encryption keys for authentication to the access point.
D、 The SSID must match on both the Company client and the Company access point. The SSID is advertised in plain-text in the access point beacon messages.
