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: "decision and game theory for security"
  Abstract: Attack-defense trees are used to describe security weaknesses of a system and possible countermeasures. In this paper, the connection between attack-defense trees and game theory is made explicit. We show that attack-defense trees and binary zero-sum two-player extensive form games have equivalent expressive power when considering satisfiability, in the sense that they can be converted into each other while preserving their outcome and their internal structure.

Connected through hyperedge HE-1 (induced by source paper "optimizing investments in cyber hygiene for protecting healthcare users"):
  with members:
    - "decision support approaches for cyber security investment"

Connected through hyperedge HE-2 (induced by source paper "securing infrastructure facilities when does proactive defense help"):
  with members:
    - "a game theoretic analysis of adversarial classification"
    - "network flow routing under strategic link disruptions"
    - "a game theoretical approach for finding optimal strategies in an intruder classification game"
    - "stochastic games for security in networks with interdependent nodes"

Connected through hyperedge HE-3 (induced by source paper "interdependent security games on networks under behavioral probability weighting"):
  with members:
    - "fragility of the commons under prospect theoretic risk attitudes"
    - "interdependent security with strategic agents and cascades of infection"
    - "stochastic games for security in networks with interdependent nodes"

Connected through hyperedge HE-4 (induced by source paper "designing the game to play optimizing payoff structure in security games"):
  with members:
    - "audit games with multiple defender resources"

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)