Which invoicing type would be recommended for milestone-based payments for services such as consulting?

Which invoicing type would be recommended for milestone-based payments for services such as consulting?
A . Service purchase order
B . Purchase order
C . No-release order contract
D . Release order contract

Answer: A

Explanation:

A Service Purchase Order is typically used for services that are invoiced based on the completion of specific tasks or milestones, such as consulting services. This allows for the tracking and payment of services based on the completion of these milestones, rather than on a simple exchange of goods.