You need to meet the requirements for the purchase order creation form.

What are two possible ways to achieve this goal? Each correct answer presents a complete solution.

NOTE: each correct selection is worth one point.

A. Create a class and add a form data source event handler method to the class.
B. In Application Explorer, create a table extension and implement validation.

C. In Application Explorer, create a form extension and implement validation.

D. Implement Chain of Command (CoC) and method wrapping by creating a form extension class.

Explanation:
Scenario:
Users must be presented with a warning message before a direct delivery purchase order is created for a vendor in exclusion list.
You must implement validation to check whether a proposed direct delivery purchase order vendor is on the exclusion list for the customer and product combination.