What should you define for an EBS before you begin implementing its operations?

What should you define for an EBS before you begin implementing its operations?

A.
contract

B.
.cfg file

C.
XSD

D.
cross-reference

Explanation:
The methodology for designing and implementing an EBS is a contract-first

methodology, that is, the contract is defined and created before the EBS is implemented. The
contract for an EBS is defined as a WSDL document.
Note: EBS(Enterprise Business Services)are the foundation blocks in the Oracle Application
Integration Architecture (AIA). EBS represent the application or implementation-independent web
service definition for performing a business task. The architecture facilitates distributed processing
using EBS.
An EBS is a service interface definition, currently manifested as an abstract Web Service
Definition Language (WSDL) document, which defines the operations, message exchange pattern,
and payload that are applicable for each operation of a service.
Reference: Oracle Fusion Middleware Concepts and Technologies Guide for Oracle Application
Integration Architecture Foundation Pack, Designing the EBS