18. Which one of the following statements is correct about rating schemes?

a. Rating schemes generate hard numbers to work with, even though they do not generate a clear sense of risk relative to other projects and organizational risks

b. Rating schemes do not quite provide a clear means to conduct a risk-by-risk analysis of probability and impact

c. Rating schemes cannot support contract strategy selection if the selection process is directly tied to the volume and nature of the project

d. In most organizations, most planning decisions hinge on an understanding of risk in the context of the organization, the common terminology offered by rating schemes makes the schemes an important support for major planning decisions