What is SAP Ariba’s recommendation for when to create a sub-agreement to an existing contract? Note: There are 2 correct answers to this question

What is SAP Ariba’s recommendation for when to create a sub-agreement to an existing contract? Note: There are 2 correct answers to this question
A . When you add a schedule (Missed)
B . When you add a statement of work (Missed)
C . When you apply changes to the language of a contract document
D . When you renew a contract

Answer: A,B