Which of the following situations could prevent a taxpayer from receiving a refund to which they are otherwise entitled? *

	Filing a return for a tax year for which the statute of limitations has not yet expired.
	Amending a return two years after the tax was paid, if paid after the filing date.
	Filing a return for a tax year for which the statute of limitations has expired.
	Amending a tax return three years after the original return was filed.