12. Capital expenditures: a. Are credited to accumulated depreciation. b. Extend an asset's useful life beyond its original estimate. c. Are additional costs of plants assets that do not materially increase the asset's life. d. Are revenue expenditures. 12. Capital expenditures: a. Are credited to accumulated depreciation. b. Extend an asset's useful life beyond its original estimate. c. Are additional costs of plants assets that do not materially increase the asset's life. d. Are revenue expenditures