When you implement a controller extension and you implement the onlnit and on AfterRendering functions in the extension, when are they called?

When you implement a controller extension and you implement the onlnit and on AfterRendering functions in the extension, when are they called?
A . Only the functions of the controller extensions are called.
B . Before the corresponding functions from the standard controller.
C . After the corresponding functions form the standard controller.

Answer: B