Which of the Following Best Describes ISO 9000

Which of the following best describes ISO 9000?

A) the concept that all employees are valuable contributors to a firm's business, and should be entrusted with decisions regarding their work
B) the redesigning of business processes to improve performance, quality, and productivity
C) a program certifying that a factory, laboratory, or office has met the quality management standards of the International Organization for Standardization
D) a certification program attesting to the fact that a factory, laboratory, or office has improved environmental performance