$2$

Managerial efforts to implement and execute a company's strategy

A$)$ can be considered successful if things go well enough that the company meets or beats its strategic and financial performance targets and shows good progress in achieving its strategic vision.

B$)$ is something that pretty much has to be done by the chief executive officer and the heads of major organizational units $($business divisions, functional departments, and key operating units$).$

C$)$ is widely considered to be harder and more managerially demanding than crafting strategy because it takes longer, involves more people, and utilizes more organizational resources.

D$)$ involve a company's whole management team, not a few senior managers, because every manager needs to be concerned with what has to be done differently or better in his$/$her area of authority to implement$/$execute the company's strategy successfully.

E$)$ Both A and D$.$