QUESTION 4 [4 marks) A system has four components. The calculations of the failure can be described by below figure. It is known that components 1 - 4 have a failure rate of 0.15, 0.021, 0.04, and 0.21 faults/year, respectively. The repair time for each component is 4, 12, 6, and 5 hrs. Assume for one year period, please calculate (a) Reliability of each component, (b) Failure probability of each component, (c) Overall failure rate, and (d) Unavailability of the system A and B, respectively. AND Answering Space for Question 4