The older channel access method used in WiFi wireless networks when dealing with collisions is CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance).
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is primarily used in wired Ethernet networks, whereas CSMA/CA is specifically designed for the challenges of wireless communication, where collision detection is not feasible.
So the correct answer is CSMA/CA.