What is the relationship between a service master record and a service specification in SAP Materials Management? Please choose the correct answer.

What is the relationship between a service master record and a service specification in SAP Materials Management? Please choose the correct answer.
A . Service master records are used as a source of data while creating service specifications
B . Service specifications are used in purchase requisitions; service mater records are used in purchase orders
C . Service specifications are created to confirm service master catalog activities
D . A service specification is the master data record that describes the structure of a service master record

Answer: A