What are the key differentiating characteristics of Oracle Reference Architecture User Interaction?

What are the key differentiating characteristics of Oracle Reference Architecture User Interaction?

A.
ORA UI is application-focused, enabling effective Integration of content and application
functionality

B.
ORA UI is user centric, providing a feature-rich, intuitive human Interface.

C.
ORA UI provides a single unified interface regardless of the complexity of underlying
applications.

D.
ORA UI standardizes on a single technology, simplifying development.

E.
ORA UI replaces portal platforms for collaboration.

Explanation:
The primary goal of user interaction is to provide a user-centric, feature-rich, intuitive
interface to end users tailored to the specific needs of each end user; thereby bringing
maximum productivity to the work environment. Realizing this goal requires a
flexible, extensible architecture since different types of end users will have very
different needs.
Reference: Oracle Reference Architecture, User Interaction, Release 3.0