Which statement is correct when planning maintenance work that is to be carried out by an external company?

[answerhappygod]

Which statement is correct when planning maintenance work that is to be carried out by an external company?

A. If you assign a control key for an external order operation, the actual values must always be entered as a goods receipt in the system.
B. A service master record must always be assigned to the external order operation.
C. In the control key assigned to the order operation, the "Service" indicator must always be activated.
D. If you assign a control key with indicator "Service" for an external service, you have to enter the actual values via the service entry sheet.