Perform a cost$/$benefit analysis using fault$-$tree analysis on a stairway. Assume that over the last year,

three accidents were caused by slippery surfaces, five were caused by inadequate railings, and three by

someone negligently leaving tools or other obstacles on the steps. The average cost for each accident was

$$200($total for first aid, lost time, etc.$).$ Assume that you have been allocated $$1,000$ to improve the

safety of the stairway $($although you don$$t need to spend all of the money$).$ There are three alternatives

which could be employed