Which of the following statements is true with respect to the accounting for business combinations under U.S. GAAP?

a. Incomparability of financial statements under the previous rules permitting two distinct methods of accounting for business combinations (purchase and pooling)

was corrected by making amortization of goodwill optional.

b. Under the current standards, impairment of goodwill is not accounted for because it does not affect the actual profit of the company.

c. The acquired business should be recognized at its fair value on the acquisition date, regardless of whether the acquirer purchases all or only a controlling percentage.

d. Any goodwill acquired in previous acquisitions should continue to be amortized after the year 2001 for the continuity of the accounting practice.