During an inspection of an office building with a remaining economic life of 10 years, you notice that the boiler is deteriorating and has a remaining useful life of only 15 years. On the date of inspection, the boiler is operative and there is no need to replace it. What is the remaining life of the boiler that would be used in a depreciation analysis?
1. 10 years, it would be treated as a part of the long-lived incurable calculations.
2. 15 years, it would be treated as a part of the short-lived incurable calculations.
3. 5 years, its economic life in excess of that of the building would be depreciated.
4. 0 years, it would be treated as part of the curable deterioration calculation.