5) a) Is it possible for a WLAN comprising of 6 wireless nodes arranged all in a straight line, to have two simultaneous transmissions? Why or why not? [4] b) What would be the interval from which a station might pick its back-off slots after the 3rd collision in a Binary Exponential Backoff Algorithm? [2] c) When is the randomization interval frozen? [1] d) After how many collisions does the algorithm throw away a frame? [1]