It also provides a transaction and database connection used by the components it contains.

Identify the business component that is being described below.
It is a smart data service containing a data model of master-detail queries that your client
interface needs to work with. It also provides a transaction and database connection used by the
components it contains.

A.
a service method

B.
a transaction

C.
an application module

D.
a view object

E.
a task flow

F.
a data control

Explanation:
http://docs.oracle.com/cd/E12839_01/web.1111/b31974/bcintro.htm (topic 3.2.1.1)