Depreciation Methods A machine with a 4-year estimated useful life and an estimated 15% residual value was acquired on January 1. Would depreciation expense using the sum-of-the-years'-digits method be higher or lower than depreciation expense using the double-declining-balance method in the first and second years? O a. First Year Lower O b. First Year Higher O c. First Year Lower O d. First Year Higher Second Year Higher Second Year Lower Second Year Lower Second Year Higher