You need to prevent users from adding PrivateColumn to the Projects list

You have a SharePoint list named Projects and a site column named PrivateColumn. You need to
prevent users from adding PrivateColumn to the Projects list. Users must be able to add any other

site column to the Projects list. What should you do?

A.
Create an event receiver that inherits SPListEventReceiver and override FieldAdded.

B.
Create an event receiver that inherits SPListEventReceiver and override FieldAdding.

C.
Create an event receiver that inherits SPItemEventReceiver and override ItemAdded.

D.
Create an event receiver that inherits SPItemEventReceiver and override ItemAdding.