Implementing and executing a company's strategy

A$.$

is a task for every manager and the whole management team, but ultimate responsibility for success or failure falls upon the top senior executives, especially the chief executive officer of the company.

B$.$

is primarily a responsibility of all company personnel because all personnel are active participants in the strategy execution process and their actions have a huge impact on the ultimate outcome.

C$.$

should be delegated to a chief strategy implementer appointed by the chief executive officer.

D$.$

is primarily the job of the company's board of directors since they direct the actions and policies of the top senior executives in executing the strategy.

E$.$

is primarily a task for middle and lower$-$level managers because it is they who have responsibility for pushing the needed changes all the way down to the lowest levels of the organization.