(Q.4) For a system which functions when all of component 1,2 , and 3 work, or else when component 4 together with one of 5 or 6 work, draw a network diagram representing this system. Having done this, write down the structure function in terms of the operational state vector. If each component is functioning with probability 0.9 independent of other components, what is the probability that the system is functioning. (Q.5) During the course we considered redundancy at system and component level. In system level redundancy an additional copy of the entire system S is run in parallel to the original system S. In component level redundancy each component e.g. 1 is run in parallel with a copy of itself e.g. 1. Explain, without detailed calculation, which setup provides higher reliability