Consider 10 stations that are all attached to 3 different bus cables. The stations exchange fixed sized frames. Each frame is of 1000 bit long and data rate of both the buses is 10 Mbps when station has something to transmit. It selects any of the three buses with equal probability and transmits at the beginning of the next time slot with probability p. Find the value of p that maxmise the rate at which the frames are successfully transmitted.