Question 9 (CSMA) a)Show me a scenario (by scenario I mean some machines at certain points in time generate a data message that they want to send over the LAN) such that 1- persistent CSMA causes a collision but non-persistent CSMA does not cause a collision. b)Same as (a) but backwards, show me a scenario in which non-persistent CSMA causes a collision but 1-persistent CSMA does not.