Final answer:
Frequency hopping is the technique that allows Bluetooth and Wi-Fi devices to cooperate without interference.
Step-by-step explanation:
The technique that allows Bluetooth and Wi-Fi devices to cooperate without interference is frequency hopping. Frequency hopping is a method where devices switch between different channels or frequencies multiple times per second. This helps to avoid congestion and minimize interference from other devices operating in the same frequency range.
For example, Bluetooth devices use frequency hopping to transmit data over short distances. They rapidly jump between different frequencies within the 2.4 GHz range, which is also used by Wi-Fi devices, to ensure reliable communication without interference.
Therefore, the correct answer is a) Frequency hopping.