In Terms of the Value Net, Which of the Following

In terms of the value net, which of the following statements is true of complementors?

A) They are individuals or groups that purchase, or receive, the outputs of an organization.
B) They are individuals, groups, or organizations that provide important inputs for an organization.
C) They are individuals or organizations that make customers value an organization's output more because of its product or service.
D) They are activities of companies designed to further some social objective and that lie beyond the direct economic interests of the organization.