Which of the following is true?

a. Regardless of the depreciation method, the amount of total depreciation expense during the life of the asset will be the same.

b. If using the straight line method, the amount of depreciation expense during the first year is higher than that of the double-declining-balance.

c. If using the units-of-production method, it is possible to depreciate more than the depreciable cost.

d. If using the double-declining-balance the total amount of depreciation expense during the life of the asset will be the highest.