What is the best definition of “Quality system”?

A.
ability to maintain availability of the IT infrastructure, services and supporting organization to
ensure these requirements are met consistently

B.
mandatory Quality management practices followed by everyone in the service provider
organizations

C.
organizational structure related to responsibilities, procedures and resources for implementing
quality management

D.
set of the measures and procedures used to ensure that the services provided continue to fulfill
the expectations of the customer and the relevant agreements