Which of the Following Statements Is True

Which of the following statements is true?

A) Accumulated amortization is that portion of a property, plant, and equipment asset's cost that has already been recorded as an expense.
B) Amortization is a process of valuation.
C) Amortization represents the cash a business has set aside to replace assets as they become fully amortized.
D) Accumulated amortization is classified as a liability account on the balance sheet.