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: "privacy things systematic approach to privacy and personal identifiable information"
  Abstract: Defining privacy and related notions such as Personal Identifiable Information (PII) is a central notion in computer science and other fields. The theoretical, technological, and application aspects of PII require a framework that provides an overview and systematic structure for the discipline’s topics. This paper develops a foundation for representing information privacy. It introduces a coherent conceptualization of the privacy senses built upon diagrammatic representation. A new framework is presented based on a flow-based model that includes generic operations performed on PII.

Connected through hyperedge HE-1 (induced by source paper "five generic processes for behavior description in software engineering"):
  with members:
    - "existential ontology and thinging modeling in software engineering"
    - "toward maximum grip process modeling in software engineering"
    - "conceptual modeling of inventory management processes as a thinging machine"
    - "thinging machine applied to information leakage"
    - "thinging vs objectfying in software engineering"
    - "tracking systems as thinging machine a case study of a service company"
    - "petri nets and machines of things that flow"
    - "conceptual modeling of a procurement process case study of rfp for public key infrastructure"

Connected through hyperedge HE-2 (induced by source paper "toward maximum grip process modeling in software engineering"):
  with members:
    - "existential ontology and thinging modeling in software engineering"
    - "conceptual modeling of inventory management processes as a thinging machine"
    - "thinging machine applied to information leakage"
    - "thinging vs objectfying in software engineering"
    - "tracking systems as thinging machine a case study of a service company"
    - "petri nets and machines of things that flow"
    - "conceptual modeling of a procurement process case study of rfp for public key infrastructure"
    - "thinging for software engineers"

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.CY(Computers and Society)