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: "the privacy coach supporting customer privacy in the internet of things"
  Abstract: The Privacy Coach is an application running on a mobile phone that supports customers in making privacy decisions when confronted with RFID tags. The approach we take to increase customer privacy is a radical departure from the mainstream research efforts that focus on implementing privacy enhancing technologies on the RFID tags themselves. Instead the Privacy Coach functions as a mediator between customer privacy preferences and corporate privacy policies, trying to find a match between the two, and informing the user of the outcome. In this paper we report on the architecture of the Privacy Coach, and show how it enables users to make informed privacy decisions in a user-friendly manner. We also spend considerable time to discuss lessons learnt and to describe future plans to further improve on the Privacy Coach concept.

Connected through hyperedge HE-1 (induced by source paper "privacy in internet of things from principles to technologies"):
  with members:
    - "internet of things survey on security"
    - "privacy by design framework for assessing internet of things applications and platforms"
    - "on the feasibility of attribute based encryption on internet of things devices"
    - "privacy in the internet of things threats and challenges"
    - "privacy and data protection by design from policy to engineering"
    - "privacy by design in big data an overview of privacy enhancing technologies in the era of big data analytics"
    - "sensing as a service model for smart cities supported by internet of things"
    - "internet of things iot a vision architectural elements and future directions"

Connected through hyperedge HE-2 (induced by source paper "decentralizing privacy enforcement for internet of things smart objects"):
  with members:
    - "internet of things iot a vision architectural elements and future directions"

Connected through hyperedge HE-3 (induced by source paper "privacy of the internet of things a systematic literature review extended discussion"):
  with members:
    - "privacy in the internet of things threats and challenges"

Connected through hyperedge HE-4 (induced by source paper "in things we trust towards trustability in the internet of things"):
  with members:
    - "the identity crisis security privacy and usability issues in identity management"

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)