Takada Diagnostics, a publicly held firm, has accumulated surplus cash. After investigating several alternatives, the company has determined that it cannot, under current economic conditions, invest the surplus to produce the level of return expected by shareholders. Which one of the following actions would best address this issue to the satisfaction of Takade's largest and most tax- sensitive shareholders?  Declare a special dividend. Declare a two-for-one stock split. Increase their regular dividend. Repurchase shares on the open market