What type of object is being described here?

What type of object is being described here?
It provides a way to co-ordinate regions on a page. It can be raised or consumed only with a
method binding that must be only data control methods, not managed bean methods.

A.
An action event

B.
A method call

C.
A task flow call

D.
A contextual event

E.
A router

F.
A data control

Explanation:
http://docs.oracle.com/cd/E12839_01/web.1111/b31974/taskflows_complex.htm