Which of the following statements regarding the sourcing of dividend income is true? Select one: Dividends from non-U.S. corporations are always foreign source. a. O b. A percentage of dividends from non-U.S. corporations are U.S. source to the extent that 25% or more of the non-U.S. corporation's gross income for the three years preceding the year of the dividend payment was effectively connected with the conduct of a U.S. trade or business. C. Dividends are sourced based on the residence of the recipient. d. Dividends from non-U.S. corporations are foreign-source only to the extent that 80% or more of the non-U.S. corporations gross income for the three years preceding the year of the dividend payment was effectively connected with the conduct of a non-U.S. trade or business