Which action should you perform?

You are a Dynamics 365 Finance and Operations developer. You need to create an extension class.

Which action should you perform?
A . Mark the class as final.
B . Add the suffix .extension to the file name.
C . Mark the class as protected.
D . Mark the class as private.

Answer: A

Explanation:

Reference: https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/extensibility/method-wrapping-coc