Peter, a tax return preparer, was found to have taken an unreasonable position with respect to a client's prepared tax return that understated the taxpayer's tax liability, and the preparer should have known it was unreasonable. If the preparer's conduct was considered willful or reckless, for what minimum penalty, if any, would he be liable? A) $250. B) $530. C) $1,000. D) Greater of $5,000 or 75% of income derived by preparer