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: "optimal control of applications for hybrid cloud services"
  Abstract: Development of cloud computing enables to move Big Data in the hybrid cloud services. This requires research of all processing systems and data structures for provide QoS. Due to the fact that there are many bottlenecks requires monitoring and control system when performing a query. The models and optimization criteria for the design of systems in a hybrid cloud infrastructures are created. In this article suggested approaches and the results of this build.

Connected through hyperedge HE-1 (induced by source paper "designing applications with distributed databases in a hybrid cloud"):
  with members:
    - "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"
    - "concept of feedback in future computing models to cloud systems"
    - "virtual laboratories in cloud infrastructure of educational institutions"
    - "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:
    - "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"
    - "virtual laboratories in cloud infrastructure of educational institutions"

Connected through hyperedge HE-3 (induced by source paper "using object relational mapping to create the distributed databases in a hybrid cloud infrastructure"):
  with members:
    - "concept of feedback in future computing models to cloud systems"
    - "virtual laboratories in cloud infrastructure of educational institutions"
    - "use of dynamical systems modeling to hybrid cloud database"
    - "autonomic cloud computing open challenges and architectural elements"

Connected through hyperedge HE-4 (induced by source paper "virtual laboratories in cloud infrastructure of educational institutions"):
  with members:
    - "laboratory test bench for research network and cloud computing"
    - "use of dynamical systems modeling to hybrid cloud database"

Connected through hyperedge HE-5 (induced by source paper "laboratory test bench for research network and cloud computing"):
  with members:
    - "use of dynamical systems modeling to hybrid cloud database"

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)