Which of the following is true of accounting for research and development cost?

• Accounting for research and development costs is same under U.S. GAAP and IFRS.

• The current accounting for research and development costs under U.S. GAAP avoids the probability of companies to manipulate their earnings.

• Under U.S. GAAP accounting for research and development costs violates the conservative principle.

• U.S.GAAP adheres to the matching principle by expensing research and development costs.