Suppose you are maintaining a large safety-critical softwa re system. You use a model, such as Porter and Selby's, to predict which components are most Likely to fail. Then, you examine those ide ntified components carefully and perform perfective and preventive maintenance on each one. Soon after. the system undergoes a catastrophic failure, with severe conseque nces to life and property. The source of the failure turns out to be a component tha t was not identified by your model.Are you at fault for neglecting to look at the o ther compo nents?