The Object Request Architecture (ORA) is a high-level framework for a
distributed environment. It consists of four components. Which of the
following items is NOT one of those components?

A.
Object Services

B.
Application Objects

C.
Application Services

D.
Object Request Brokers (ORBs)

Explanation:
The other answers plus Common Facilities comprise the ORA. The
ORA is a product of the Object Management Group (OMG), which is a
nonprofit consortium in Framingham, Massachusetts that was put
together in 1989 to promote the use of object technology in distributed
computing systems (www.omg.org).

*The ORB is the fundamental building block of ORA and manages the communications
between the ORAentities. The purpose of the ORB is to support
the interaction of objects in heterogeneous, distributed environments.
The objects may be on different types of computing platforms.
*Object Services, supports the ORB in creating and tracking
objects as well as performing access control functions.
*Application Objects and Common Facilities support the end user and use
the system services to perform their functions.