Initiating actions to boost the combined performance of the corporation's collection of businesses includes all of the following strategic options, EXCEPT Select one: a. broadening the scope of diversification by entering additional industries b. divesting some businesses and retrenching to a narrower collection of businesses c. refocusing the existing businesses on new substitute product-line opportunities outside the existing industry framework. d. sticking closely with the existing business lineup and pursuing available opportunities e. restructuring the entire company by adding and removing businesses to improve overall performance.