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: "iotc2 a formal method approach for detecting conflicts in large scale iot systems"
  Abstract: Internet of Things (IoT) has become a common paradigm for different domains such as health care, transportation infrastructure, smart home, smart shopping, and e-commerce. With its interoperable functionality, it is now possible to connect all domains of IoT together for providing competent services to the users. Because numerous IoT devices can connect and communicate at the same time, there can be events that trigger conflicting actions to an actuator or an environmental feature. However, there have been very few research efforts made to detect conflicting situation in IoT system using formal method. This paper provides a formal method approach, IoT Confict Checker (IoTC2), to ensure safety of controller and actuators' behavior with respect to conflicts. Any policy violation results in detection of the conflicts. We defined the safety policies for controller, actions, and triggering events and implemented the those with Prolog to prove the logical completeness and soundness. In addition to that, we have implemented the detection policies in Matlab Simulink Environment with its built-in Model Verification blocks. We created smart home environment in Simulink and showed how the conflicts affect actions and corresponding features. We have also experimented the scalability, efficiency, and accuracy of our method in the simulated environment.

Connected through hyperedge HE-1 (induced by source paper "viscr intuitive conflict free automation for securing the dynamic consumer iot infrastructures"):
  with members:
    - "soteria automated iot safety and security analysis"
    - "sensitive information tracking in commodity iot"
    - "fog computing for sustainable smart cities a survey"
    - "decoupled ifttt constraining privilege in trigger action platforms for the internet of things"
    - "snap stateful network wide abstractions for packet processing"
    - "a fast compiler for netkat"
    - "merlin a language for provisioning network resources"

Connected through hyperedge HE-2 (induced by source paper "detecting safety and security faults in plc systems with data provenance"):
  with members:
    - "provenance based intrusion detection opportunities and challenges"
    - "curator provenance management for modern distributed systems"

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.CR(Cryptography and Security)