Question: a device on a CSMA network with collision avoidance has a frame of data to send and sense that the channel is idle. What should

a device on a CSMA network with collision avoidance has a frame of data to send and sense that the channel is idle. What should it do next ?
a. send its data immediately and continue to sense the network for at least 2Tp to ensure no collisions occured
b. apply one of the persistence methods
c. Wait a short period (IFS) and then sense the network again periodically at the specific time slots until the network is found to be idle again the contention window
d. wait a short period(IFS) and then send an RTS message

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