Which of the following statements is true for p-persistent CSMA?
1
A station senses the channel when it wants to send a frame, and if no one else is sending, the station begins doing so itself. However, if the channel is already in use, the station does not continually sense it for the purpose of seizing it immediately upon detecting the end of the previous transmission.
2
It applies to slotted channels. When a station becomes ready to send, it senses the channel. If it is idle, it transmits with a probability p. With a probability q = 1 − p, it defers until the next slot.
3
When a station has data to send, it first listens to the channel to see if anyone else is transmitting at that moment. If the channel is idle, the stations send its data. Otherwise, if the channel is busy, the station just waits until it becomes idle. Then the station transmits a frame.
4
None of the above