Control quality is:

a. applying the planned, systematic quality activities to ensure that the project employs all processes needed to meet requirements

b. identifying which quality standards are relevant to the project and determining how to satisfy them

c. monitoring specific project results to determine if they comply with relevant quality standards and identifying ways to eliminate causes of unsatisfactory performance

d. all the activities of the performing organization that determine quality policies, objectives, and responsibilities so that the project will satisfy the needs for which it was undertaken.