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: "challenges of internet of things and big data integration"
  Abstract: The Internet of Things anticipates the conjunction of physical gadgets to the In-ternet and their access to wireless sensor data which makes it expedient to restrain the physical world. Big Data convergence has put multifarious new opportunities ahead of business ventures to get into a new market or enhance their operations in the current market. considering the existing techniques and technologies, it is probably safe to say that the best solution is to use big data tools to provide an analytical solution to the Internet of Things. Based on the current technology deployment and adoption trends, it is envisioned that the Internet of Things is the technology of the future, while to-day's real-world devices can provide real and valuable analytics, and people in the real world use many IoT devices. Despite all the advertisements that companies offer in connection with the Internet of Things, you as a liable consumer, have the right to be suspicious about IoT advertise-ments. The primary question is: What is the promise of the Internet of things con-cerning reality and what are the prospects for the future.

Connected through hyperedge HE-1 (induced by source paper "blockchain of things bcot the fusion of blockchain and iot technologies"):
  with members:
    - "lapps technological legal and market potentials of blockchain lightning network applications"
    - "atomic cross chain swaps development trajectory and potential of non monetary digital token swap facilities"
    - "a novel approach for network attack classification based on sequential questions"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "a survey of distributed certificate authorities in manets"
    - "internet of nano things things and everything future growth trends"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "blockchain enabled enhanced iot ecosystem security"

Connected through hyperedge HE-2 (induced by source paper "internet of nano things things and everything future growth trends"):
  with members:
    - "internet of things survey on security"
    - "applications of blockchain technology beyond cryptocurrency"
    - "application of blockchain in booking and registration systems of securities exchanges"
    - "a recruitment and human resource management technique using blockchain technology for industry 4 0"
    - "mobile academy a ubiquitous mobile learning mlearning platform"
    - "a framework for android based shopping mall applications"
    - "multilingual website usability analysis based on an international user survey"
    - "user interface ui design issues for multilingual users a case study"

Connected through hyperedge HE-3 (induced by source paper "internet of things infrastructure architecture security and privacy"):
  with members:
    - "the rise of internet of things iot in big healthcare data review and open research issues"
    - "blockchain enabled enhanced iot ecosystem security"
    - "treatment of reactive routing protocols using second chance based on malicious behavior of nodes in manets"
    - "a review on internet of things iot internet of everything ioe and internet of nano things iont"

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)