Which of the following 802.11 transmission requirements contributes to its inefficiency?
a. Before it can associate, a station must listen for an access point’s beacon on every channel within its frequency range.
b. A source node must regularly ping the access point to ensure it is still available for transmitting data to the rest of the stations.
c. A destination node must issue an acknowledgment for every packet that is received intact.
d. Before transmitting, a source node must check to ensure the access point has not changed its SSID.
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