The Primary Roles/obligations of a Company's Board of Directors in the Strategy-Making,strategy-Executing

The primary roles/obligations of a company's board of directors in the strategy-making,strategy-executing process include

A) playing the lead role in forming the company's strategy and then directly supervising the efforts and actions of senior executives in implementing and executing the strategy.
B) providing guidance and counsel to the CEO in carrying out his/her duties as chief strategist and chief strategy implementer.
C) overseeing the company's direction, strategy and business approaches and evaluating the caliber of senior executives' strategy-making and strategy-executing skills.
D) working closely with the CEO, senior executives, and the strategic planning staff to develop a strategic plan for the company and then overseeing how well the CEO and senior executives carry out the board's directives in implementing and executing the strategic plan.
E) reviewing and approving the company's business model and also reviewing and approving the proposals and recommendations of the CEO as to how to execute the business model.