Which is the BEST definition of a supplier?
A. It is a third party responsible for supplying goods or services that are required to deliver IT services
B. It is a shared services unit that is responsible for supplying goods or services that are required to deliver IT services
C. It is a third party with responsibility for supplying goods or services that is agreed through an operational level agreement
D. It is a mixture of internal and external parties that are responsible for providing goods and services to its customer group
