Which Oracle SOA Suite component directly enables this behavior?

The identity context is opaque to your web service client and web service and you don’t need to
perform any additional coding or processing in your client or service to support it after you enable
identity context propagation.
Which Oracle SOA Suite component directly enables this behavior?

A.
Oracle Web Service Manager Policy Manager

B.
Oracle BPEL Process Manager

C.
Oracle Enterprise Manager

D.
Oracle User Messaging Service

Explanation:

https://docs.oracle.com/middleware/1212/ums/UMSAG/introduction.htm