Which three statements are true about managed bean usage within task flows?

Which three statements are true about managed bean usage within task flows?

A.
A managed bean can be used within a task flow router activity to evaluate a navigation case.

B.
You must explicitly instantiate a managed bean before using it.

C.
Managed beans are only available in bounded task flows.

D.
Common task flow actions can be placed in a managed bean within a task flow template.

E.
A task flow parameter can reference a managed bean.

F.
A managed bean always remains in scope while the task flow within which it is used is active.

Explanation:
http://prasanna-adf.blogspot.com/2008/02/managed-bean.html