Which two types of activities does the Lightweight Access Point Protocol （LWAPP） define？ （Choose two.）（）

A. probe request/response， authentication request/response， association request/response
B. association request/response， authentication request/response， probe request/response
C. probe request/response， association request/response， authentication request/response
D. association request/response， probe request/response， authentication request/response

A. Voice traffic data flow involves large volumes of large packets.
B. Because a packet loss involves a small amount of data， voice traffic is less affected by packet losses than traditional data traffic is.
C. Voice carrier stream utilizes Real-Time Transport Protocol （RTP） to carry the audio/media portion of VoIP communication.
D. Voice packets are very sensitive to delay and jitter.
E. Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.

A. It indicates that the radio of the client adapter is disabled.
B. It indicates that the client adapter is not associated to an access point or another client. 
C. It indicates that the client adapter is associated to an access point or another client， but the user is not  EAP authenticated.
D. It indicates that the client adapter is associated to an access point or another client， that the user is  authenticated if the client adapter is configured for EAP authentication， and that the signal strength is  excellent or good.
E. It indicates that the client adapter is associated to an access point or another client， that the user is  authenticated if the client adapter is configured for EAP authentication， and that the signal strength is fair.
F. It indicates that the client adapter is associated to an access point or another client， that the user is  authenticated if the client adapter is configured for EAP authentication， and that the signal strength is poor.