Effects of gender on a company's performance

      What effect does gender have on a company's performance? a. Companies in which men occupy 90% or more of the executive positions show better performance than companies with more female executives. b. Companies in which women occupy 70% or more of the executive positions show better performance than companies with fewer female executives. c. Companies with no female executives outperform companies with female executives. d. Companies with a mixture of male and female executives outperform companies with a gender imbalance of executives.