John has two web services on his Windows 2008 server. He needs his three other 2000 servers to be able to access these services and interact with them. Which of the following best describes that protocol that is required for this?

A.
XML

B.
HTTPS

C.
FTP

D.
SOAP

Explanation:
Simple Object Access Protocol (SOAP) is an XML-based protocol that encodes messages in a web service setup. So if you have a Windows 2000 computer, for instance, and you need to access a Windows 2008 computer that offers a specific web service, the programs on both systems can communicate using SOAP without running into inter operability issues. This communication most commonly takes place over HTTP because it is readily available in basically all computers today.