What are the differences between executive and non-executive directors? Which of the following answers is correct?

a. Non-executive directors are appointed to the board of directors but are not paid for their role

b. Non-executive directors are appointed to the board on the basis of their experience; they have no say in company management unlike the executive directors

c. Executive directors are those who are salaried directors, who manage the company as employees

d. Executive directors are senior executives, who are placed on the board because of their experience in their respective fields; they are not permitted to work in the company as that would be a conflict of interest