Which document type can you assign for the order acknowledgment requirement in the Indicator tab?

You want to maintain the settings for the ‘default values for purchasing1 (EVO) parameter in SAP Materials Management.

Which document type can you assign for the order acknowledgment requirement in the Indicator tab? Please choose the correct answer.
A . Reservation
B . Purchase requisition
C . Request for quotation.
D . Scheduling agreement

Answer: D