Which of the following ensure that managers operate in their stockholders' interests rather than their own personal interests? a. the threat of firing by the board of directors. b. the threat of a hostile takeover possibly resulting in top managers losing their jobs. if the stock price is below its intrinsic value, this threat is magnified. c. compensation packages designed to provide incentives for management to maximize the long-run stock price. d. all of these keep management focused on stockholders' interests as reflected in maximizing the long-run stock price.