WLAN(Wireless Local Area Network)의 MAC 알고리즘으로 옳은 것은?

1. 1

   FDMA(Frequency Division Multiple Access)

2. 2

   CDMA(Code Division Multiple Access)

3. 3

   CSMA/CA(Carrier Sense Multiple Access Collision Avoidance)

4. 4

   CSMA/CD(Carrier Sense Multiple Access Collision Detection)