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: "speci a simulation tool exploring cloud scale data centres"
  Abstract: There is a rapid increase in the size of data centres (DCs) used to provide cloud computing services. It is commonly agreed that not all properties in the middleware that manages DCs will scale linearly with the number of components. Further, "normal failure" complicates the assessment of the performance of a DC. However, unlike in other engineering domains, there are no well established tools that allow the prediction of the performance and behaviour of future generations of DCs. SPECI, Simulation Program for Elastic Cloud Infrastructures, is a simulation tool which allows exploration of aspects of scaling as well as performance properties of future DCs.

Connected through hyperedge HE-1 (induced by source paper "usage of cloud computing simulators and future systems for computational research"):
  with members:
    - "the making of cloud applications an empirical study on software development for the cloud"

Connected through hyperedge HE-2 (induced by source paper "dissect cf a simulator to foster energy aware scheduling in infrastructure clouds"):
  with members:
    - "htc scientific computing in a distributed cloud environment"
    - "modeling and simulation of scalable cloud computing environments and the cloudsim toolkit challenges and opportunities"
    - "gridsim a toolkit for the modeling and simulation of distributed resource management and scheduling for grid computing"

Connected through hyperedge HE-3 (induced by source paper "experimenting with request assignment simulator ras"):
  with members:
    - "modeling and simulation of scalable cloud computing environments and the cloudsim toolkit challenges and opportunities"

Connected through hyperedge HE-4 (induced by source paper "speci 2 an open source framework for predictive simulation of cloud scale data centres"):
  with members:
    - "hybrid complex network topologies are preferred for component subscription in large scale data centres"
    - "effects of component subscription network topology on large scale data centre performance scaling"

Connected through hyperedge HE-5 (induced by source paper "hybrid complex network topologies are preferred for component subscription in large scale data centres"):
  with members:
    - "effects of component subscription network topology on large scale data centre performance scaling"

Connected through hyperedge HE-6 (induced by source paper "effects of component subscription network topology on large scale data centre performance scaling"):
  with members:
    - "modeling and simulation of scalable cloud computing environments and the cloudsim toolkit challenges and opportunities"
    - "decentralized overlay for federation of enterprise clouds"

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)