Which of the following statements about tangible and intangible assets is true? O a. Tangible assets result in depletion expense, while intangible assets result in no expense O b. Tangible assets result in depletion expense, while intangible assets result in amortization expense Oc. Tangible assets result in depreciation expense, while intangible assets result in depletion expense O d. Tangible assets result in depreciation expense, while intangible assets result in amortization expense