If a tax payer claiming the American Oppeotunity Tax Credit has their tax liability reduced to zero, what is the maximum amount the may receive as a refundable credit?

A$)25\%$ of the credit, upto $$2,000$

B$)40\%$ of the credit, upto $$1000$

C$)100\%$ of the first $$2,000$ of qualified education expenses

D$)100\%$ of the first $$4,000$ of qualified education expenses