Which of the Following Statements Is True Concerning ISO 9000

Which of the following statements is true concerning ISO 9000 standards?
I. They are intended to prevent nonconformities during all stages of inspection
II. There is only one ISO 9000 standard and it only applies to manufacturing.
III. They describe the fundamental concepts of a quality management system.

A) I only is true
B) II only is true
C) III only is true
D) I and II are true
E) All of the above are true