Which of the following is true with regard to bases of power? a) coercive power involves an identification with and imitation of the person in power. b) legitimate power is used by companies when they hire celebrities to promote their products. c) expert and referent power are the two major types of formal power. d) the personal sources of power are most effective for increasing employee performance and satisfaction. e) reward power is the most common and broad type of power seen in operation in organizations.