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: "explainable security"
  Abstract: The Defense Advanced Research Projects Agency (DARPA) recently launched the Explainable Artificial Intelligence (XAI) program that aims to create a suite of new AI techniques that enable end users to understand, appropriately trust, and effectively manage the emerging generation of AI systems.  In this paper, inspired by DARPA's XAI program, we propose a new paradigm in security research: Explainable Security (XSec). We discuss the ``Six Ws'' of XSec (Who? What? Where? When? Why? and How?) and argue that XSec has unique and complex characteristics: XSec involves several different stakeholders (i.e., the system's developers, analysts, users and attackers) and is multi-faceted by nature (as it requires reasoning about system model, threat model and properties of security, privacy and trust as well as about concrete attacks, vulnerabilities and countermeasures). We define a roadmap for XSec that identifies several possible research directions.

Connected through hyperedge HE-1 (induced by source paper "secure cloud edge deployments with trust"):
  with members:
    - "how to place your apps in the fog state of the art and open challenges"
    - "demystifying fog computing characterizing architectures applications and abstractions"
    - "online placement of multi component applications in edge computing environments"

Connected through hyperedge HE-2 (induced by source paper "explainable software for cyber physical systems es4cps report from the gi dagstuhl seminar 19023 january 06 11 2019 schloss dagstuhl"):
  with members:
    - "formal specification and verification of autonomous robotic systems a survey"
    - "the orca hub explainable offshore robotics through intelligent interfaces"
    - "introducing liveness into multi lane spatial logic lane change controllers using uppaal"
    - "explain yourself a natural language interface for scrutable autonomous robots"
    - "rapid quality assurance with requirements smells"
    - "imperfect knowledge in autonomous urban traffic manoeuvres"
    - "cyber physical systems security a survey"
    - "causes and explanations a structural model approach part ii explanations"

Connected through hyperedge HE-3 (induced by source paper "economics of human ai ecosystem value bias and lost utility in multi dimensional gaps"):
  with members:
    - "explaining explanations in ai"
    - "towards providing explanations for ai planner decisions"
    - "explanation in artificial intelligence insights from the social sciences"
    - "what does explainable ai really mean a new conceptualization of perspectives"
    - "flexibly bounded rationality and marginalization of irrationality theories for decision making"
    - "soft goals can be compiled away"
    - "ordered landmarks in planning"
    - "decision theoretic planning structural assumptions and computational leverage"

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)