Which two should the App Builder consider before overriding standard buttons?

An App Builder at UVC would like to prevent users from creating new records on an Account related list by overriding standard buttons.

Which two should the App Builder consider before overriding standard buttons?
A . Standard buttons can be changed on lookup dialogs, list views, and search result layouts
B . Standard buttons can be overridden with a Visualforce page
C . Standard buttons that are not available for overrides can still be hidden on page layouts
D . Standard buttons can be overridden, relocated on the detail page, and relabeled

Answer: B,C