human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "the clarens web services architecture"
  Abstract: Clarens is a Grid-enabled web service infrastruture implemented to augment the current batch-oriented Grid services computing model in the Compound Muon Solenoid (CMS) experiment of the LHC. Clarens servers leverage the Apache web server to provide a scalable framework for clients to communicate with services using the SOAP and XML-RPC protocols. This framework provides security, session persistent storage, service standards wherever possible instead of inventing new standards. This paper describes the basic architeture of Clarens, while a companion paper describes clients and services that take advantage of this architecture. More information and documentation is also available at the Clarens web page at http://clarens.sourceforge.net.

Connected through hyperedge HE-1 (induced by source paper "mobile computing in physics analysis an indicator for escience"):
  with members:
    - "distributed analysis and load balancing system for grid enabled analysis on hand held devices using multi agents systems"
    - "security for grid services"
    - "clarens client and server applications"

Connected through hyperedge HE-2 (induced by source paper "a grid enabled interface to condor for interactive analysis on handheld and resource limited devices"):
  with members:
    - "security for grid services"
    - "clarens client and server applications"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DC(Distributed, Parallel, and Cluster Computing)