What are some characteristics of a release procedure for purchase orders?

your company uses the classic release procedure for purchase orders .

What are some characteristics of a release procedure for purchase orders?
A . the output of purchase order is NOT possible before approval
B . release procedure for purchase order are possible without classification
C . The release rejection of a purchase order is the only possible at header level
D . the release or rejection of a purchase order is only possible at line item level

Answer: A,B,C