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: "simplifying the development use and sustainability of hpc software"
  Abstract: Developing software to undertake complex, compute-intensive scientific processes requires a challenging combination of both specialist domain knowledge and software development skills to convert this knowledge into efficient code. As computational platforms become increasingly heterogeneous and newer types of platform such as Infrastructure-as-a-Service (IaaS) cloud computing become more widely accepted for HPC computations, scientists require more support from computer scientists and resource providers to develop efficient code and make optimal use of the resources available to them. As part of the libhpc stage 1 and 2 projects we are developing a framework to provide a richer means of job specification and efficient execution of complex scientific software on heterogeneous infrastructure. The use of such frameworks has implications for the sustainability of scientific software. In this paper we set out our developing understanding of these challenges based on work carried out in the libhpc project.

Connected through hyperedge HE-1 (induced by source paper "talk to me a case study on coordinating expertise in large scale scientific software projects"):
  with members:
    - "which sustainable software practices do scientists find most useful"

Connected through hyperedge HE-2 (induced by source paper "summary of the first workshop on sustainable software for science practice and experiences wssspe1"):
  with members:
    - "experiences from software engineering of large scale amr multiphysics code frameworks"
    - "software abstractions and methodologies for hpc simulation codes on future architectures"
    - "transitive credit as a means to address social and technological concerns stemming from citation and attribution of digital products"
    - "initial findings from a study of best practices and models for cyberinfrastructure software sustainability"
    - "sustainable software development for next gen sequencing ngs bioinformatics on emerging platforms"
    - "experiences with automated build and test for geodynamics simulation codes"
    - "cactus issues for sustainable simulation software"
    - "sustainable software ecosystems for open science"

Connected through hyperedge HE-3 (induced by source paper "first workshop on on sustainable software for science practice and experiences wssspe submission and peer review process and results"):
  with members:
    - "software abstractions and methodologies for hpc simulation codes on future architectures"
    - "initial findings from a study of best practices and models for cyberinfrastructure software sustainability"
    - "sustainable software development for next gen sequencing ngs bioinformatics on emerging platforms"
    - "experiences with automated build and test for geodynamics simulation codes"
    - "cactus issues for sustainable simulation software"
    - "sustainable software ecosystems for open science"
    - "visit experiences with sustainable software"
    - "enabling reproducible science with vistrails"

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)