What type of reusable component is being described here?

What type of reusable component is being described here?
They define reusable skeletons which are available to be extended, and therefore, cannot be run
on their own. They can be based on another reusable component of the same type. The reuse
mechanisms are provided: by copy and by reference

A.
Application mechanisms

B.
Application modules

C.
Page templates

D.
Task flow templates

E.
Task flows

F.
Declarative components

Explanation:

http://www.oracle.com/technetwork/developer-tools/adf/learnmore/oracle-adf-11g-primer-154277.pdf (page 9)