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: "virtual laboratories in cloud infrastructure of educational institutions"
  Abstract: Modern educational institutions widely used virtual laboratories and cloud technologies. In practice must deal with security, processing speed and other tasks. The paper describes the experience of the construction of an experimental stand cloud computing and network management. Models and control principles set forth herein.

Connected through hyperedge HE-1 (induced by source paper "designing applications with distributed databases in a hybrid cloud"):
  with members:
    - "optimal control of applications for hybrid cloud services"
    - "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"
    - "concept of feedback in future computing models to cloud systems"
    - "use of dynamical systems modeling to hybrid cloud database"

Connected through hyperedge HE-2 (induced by source paper "experimental study of the cloud architecture selection for effective big data processing"):
  with members:
    - "optimal control of applications for hybrid cloud services"
    - "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"

Connected through hyperedge HE-3 (induced by source paper "designing applications in a hybrid cloud"):
  with members:
    - "experimental study of the cloud architecture selection for effective big data processing"
    - "designing applications with distributed databases in a hybrid cloud"

Connected through hyperedge HE-4 (induced by source paper "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"):
  with members:
    - "optimal control of applications for hybrid cloud services"
    - "concept of feedback in future computing models to cloud systems"
    - "use of dynamical systems modeling to hybrid cloud database"
    - "autonomic cloud computing open challenges and architectural elements"

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)