A channel using random access protocols has three stations on a bus with end-to-end propagation delay . Station A is located at one end of the bus, and stations B and C are together located at the other end of the bus. Frames arrive at the three stations and are ready to be transmitted at stations A,B, and C at the respective times tA=/2,tB=3/2, and tC=3. Frames require transmission times of 3 and waiting for ACK takes 2. In appropriate figures, with time as the horizontal axis, show the transmission activity of each of the three stations for: a) Slotted ALOHA, Slot Interval = c) 1-persistent CSMA-CD