(a) A safety-critical system fails and several lives are lost. When the cause of the failure is investigated, the inquiry commission discovers that the test plan neglected to consider the case that caused the system failure. Who is responsible? Justify your answer. (10 marks) (b) (c) Sometimes a customer requests a requirement that you know is impossible to implement. Should you agree to put the requirement in the requirements specification document anyway, thinking that you might come up with a novel way of meeting it, or thinking that you will ask that the requirement be dropped later? What are the ethical implications of promising what you know you cannot deliver? Explain. (10 marks) If one person has written a component but others have revised it, who is responsible if the component fails? Explain. (5 marks)