Which approach (and accompanying reasoning) describes a loosely coupled and robust solution?

A partner needs to access services that are defined in one of your Service Composite Architecture
(SCA) applications via a web service interface. Which approach (and accompanying reasoning)
describes a loosely coupled and robust solution?

A.
Use Oracle Service Bus to provide an Interface layer over your SCA application. This enables
you to hide the locations of your SCA application, perform load-balancing across those endpoints,
and provide the ability to define service level agreements to help ensure that you are meeting your
contractual obligations to the partner.

B.
Use the Mediator component to provide a web service interface to your SCA application. This
arrives you the flexibility of using the industry standard XSLT technology to perform translation and
transformations.

C.
Use Oracle Service Bus to provide an interface layer over your SCA application. This enables
you to “skin” your SCA application with a web service interface and still provide a robust
experience to the partner.

D.
Allow the partner simply to connect directly to the SCA application. This provides the best
performance and helps keep the partner happy.

Explanation:
* Oracle Service Bus supports the following capabilities for the transformation or
processing of messages:
/ Transforms messages based on XQuery or XSLT
etc:
Validates incoming messages against schemas
Selects a target service or services, based on the message content or message headers
Transforms messages based on the target service
Supports transformations on both XML and MFL messages

Message enrichment
Supports callouts to Web services to gather additional data for transformation (for example,
country code, full customer records, and so on)
* Oracle Service Bus Intermediary