How can you prevent a release order in excess of the target quantity?

Your purchasing organization has entered into a contractual agreement with a supplier to purchase 10000 units of a particular material. You have stored this agreement as a quantity contract.

How can you prevent a release order in excess of the target quantity? Please choose the correct answer.
A . You must implement a BAdl to check the target quantity in the contract release order and prevent release if the quantity exceeds it.
B . If the order quantity exceeds the target quantity, a warning message is issued. You can set this as an error message in Customizing to prevent release.
C . If the order quantity exceeds the target quantity, a dialog box opens. You can use a special authorization to control whether the user may order the excess quantity.
D . The system prevents exceeding the target quantity in a release order. NO additional action is required from you.

Answer: B