Which of the following statements regarding effective organizational cultures is true? Select one: a. Once a corporate culture is developed, strategic leaders can focus on other activities. b. Organizational culture can be a source of competitive advantage because it helps regulate and control employee behavior and influences how the firm conducts its business. c. A central task of strategic leaders is to revise the corporate culture on an annual basis after analyzing the changes occurring in the competitive environment. d. A strategy that is historically new for a firm should be implemented by incremental changes in the organization's culture.