According to lan Redpath and Robert Feenan, which of the following is correct regarding a trade or business? . Taxpayer A must materially participate in ABC Corporation for the corporation to be classified as a trade or business Material participation by more than 50% of a company's investors is required before the company can be classified as a trade or business. ABC Corporation cannot be a passive activity for Taxpayer All Taxpayer B considers it to be a c. trade or business. ABC Corporation can be classified as a trade or business even though some investors in the D. corporation do not materially participate