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: "a grid service broker for scheduling distributed data oriented applications on global grids"
  Abstract: The next generation of scientific experiments and studies, popularly called as e-Science, is carried out by large collaborations of researchers distributed around the world engaged in analysis of huge collections of data generated by scientific instruments. Grid computing has emerged as an enabler for e-Science as it permits the creation of virtual organizations that bring together communities with common objectives. Within a community, data collections are stored or replicated on distributed resources to enhance storage capability or efficiency of access. In such an environment, scientists need to have the ability to carry out their studies by transparently accessing distributed data and computational resources. In this paper, we propose and develop a Grid broker that mediates access to distributed resources by (a) discovering suitable data sources for a given analysis scenario, (b) suitable computational resources, (c) optimally mapping analysis jobs to resources, (d) deploying and monitoring job execution on selected resources, (e) accessing data from local or remote data source during job execution and (f) collating and presenting results. The broker supports a declarative and dynamic parametric programming model for creating grid applications. We have used this model in grid-enabling a high energy physics analysis application (Belle Analysis Software Framework). The broker has been used in deploying Belle experiment data analysis jobs on a grid testbed, called Belle Analysis Data Grid, having resources distributed across Australia interconnected through GrangeNet.

Connected through hyperedge HE-1 (induced by source paper "global grids and software toolkits a study of four grid middleware technologies"):
  with members:
    - "alchemi a net based grid computing framework and its integration into global grids"
    - "the gridbus toolkit for service oriented grid and utility computing an overview and status report"
    - "economic based distributed resource management and scheduling for grid computing"
    - "the anatomy of the grid enabling scalable virtual organizations"

Connected through hyperedge HE-2 (induced by source paper "a case for cooperative and incentive based coupling of distributed clusters"):
  with members:
    - "tycoon a distributed market based resource allocation system"
    - "libra an economy driven job scheduling system for clusters"
    - "gridsim a toolkit for the modeling and simulation of distributed resource management and scheduling for grid computing"
    - "the anatomy of the grid enabling scalable virtual organizations"

Connected through hyperedge HE-3 (induced by source paper "a taxonomy of workflow management systems for grid computing"):
  with members:
    - "the gridbus toolkit for service oriented grid and utility computing an overview and status report"
    - "the anatomy of the grid enabling scalable virtual organizations"
    - "nimrod g an architecture for a resource management and scheduling system in a global computational grid"

Connected through hyperedge HE-4 (induced by source paper "the gridbus toolkit for service oriented grid and utility computing an overview and status report"):
  with members:
    - "alchemi a net based grid computing framework and its integration into global grids"
    - "gridscape a tool for the creation of interactive and dynamic grid testbed web portals"
    - "gridemail a case for economically regulated internet based interpersonal communications"
    - "economic based distributed resource management and scheduling for grid computing"
    - "nimrod g an architecture for a resource management and scheduling system in a global computational grid"

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)