Which of the following statement(s) is(are) true? a. On average, an announcement of an increase in dividend yields of 10 or more basis points results in a relatively large price increase b. All are true c. Only the announcement that a firm will begin paying dividends for the first time has any effect on a stocks price d. On average, an announcement by a firms board of directors that they will continue with their current dividend policy has no effect on the price of the stock.