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(Choose 1 answer)
P2P systems have all of the following key characteristics EXCEPT:
A. They provide for real-time access to other users through techniques such as instant messaging and multichannel collaboration applications
B. The users' computers can act as both clients and servers
C. The overall system is well integrated, but lacks tools for easy creation of content or for adding functionalities
D. They support cross-networking protocols such as SOAP or XML-RPC, which enables a program on one computer to execute a program on a server computer
