Identify three objects from which scenarios can be generated.

Identify three objects from which scenarios can be generated.

A.
Interface

B.
Variable

C.
Package

D.
Knowledge modules

E.
Trail

F.
Extract

Explanation:
http://docs.oracle.com/cd/E23943_01/integrate.1111/e12643/scenarios.htm#BACDFAHD
(see topic 13.2)