(Answer all questions, state assumptions clearly) A. A comprehensive definition of reliability is as folloPS: "Reliability is the (1) conditional probability, at a given (2) confidence level, that the eqpt will perform their intended functions satisfactorily or (3) without failure and within specified performance limits, at a given (4) age, for a specified length of time or (5) mission time, when used in the manner and for the purpose intended while operating under the specified application and operation environments with their associated (6) stress levels." Discuss the meaning and implication(s) of each of the numbered points. B. A comprehensive definition of maintainability is as folloPS: "Maintainability is the (1) probability of successfully performing and completing a specified corrective maint action or a specified preventive maint action or both, (2) within a prescribed period of time, (3) at a desired confidence level, (4) with a specified manpower, skill levels, test eqpt, tech data, operating and maint manuals, and maint support org and facilities, and (5) under specific environmental conditions ...." Discuss the meaning and implication(s) of each of the numbered points. C. Reliability R(t)=et/MTBFet Maintainability M(t)=1etMTTR=1et where MTBF and MTTR are assumed to be constant. Intuitively, does the formula for Maintainability make sense? Explain in your own words. Let MTBF and MTTR =1. Draw R(t) and M(t) on the same graph. What can you deduce from these two graphs? Motivate. D. What is (in your opinion) the single most significant "drawback" of the exponential probability function? (Hint: refer to Assignment No. 44.A. v)