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: "it security plan for flight simulation program"
  Abstract: Information security is one of the most important aspects of technology, we cannot protect the best interests of our organizations' assets (be that personnel, data, or other resources), without ensuring that these assetsare protected to the best of their ability. Within the Defense Department, this is vital to the security of not just those assets but also the national security of the United States. Compromise insecurity could lead severe consequences. However, technology changes so rapidly that change has to be made to reflect these changes with security in mind. This article outlines a growing technological change (virtualization and cloud computing), and how to properly address IT security concerns within an operating environment. By leveraging a series of encrypted physical and virtual systems, andnetwork isolation measures, this paper delivered a secured high performance computing environment that efficiently utilized computing resources, reduced overall computer processing costs, and ensures confidentiality, integrity, and availability of systems within the operating environment 1 .

Connected through hyperedge HE-1 (induced by source paper "complete network security protection for sme s within limited resources"):
  with members:
    - "video surveillance in the cloud"
    - "non profit organizations need to address security for effective government contracting"
    - "information security synthesis in online universities"
    - "cloud computing avoids downfall of application service providers"
    - "security risks in mechanical engineering industries"
    - "enhancing infrastructure security in real estate"
    - "it security issues within the video game industry"
    - "an overview of the security concerns in enterprise cloud computing"

Connected through hyperedge HE-2 (induced by source paper "healthcare it is your information at risk"):
  with members:
    - "video surveillance in the cloud"
    - "non profit organizations need to address security for effective government contracting"
    - "information security synthesis in online universities"
    - "cloud computing avoids downfall of application service providers"
    - "security risks in mechanical engineering industries"
    - "enhancing infrastructure security in real estate"
    - "it security issues within the video game industry"
    - "an overview of the security concerns in enterprise cloud computing"

Connected through hyperedge HE-3 (induced by source paper "non profit organizations need to address security for effective government contracting"):
  with members:
    - "information security synthesis in online universities"
    - "cloud computing avoids downfall of application service providers"
    - "security risks in mechanical engineering industries"
    - "enhancing infrastructure security in real estate"
    - "it security issues within the video game industry"
    - "an overview of the security concerns in enterprise cloud computing"
    - "information security plan for flight simulator applications"
    - "convergence of corporate and information security"

Connected through hyperedge HE-4 (induced by source paper "video surveillance in the cloud"):
  with members:
    - "information security synthesis in online universities"
    - "cloud computing avoids downfall of application service providers"
    - "security risks in mechanical engineering industries"
    - "enhancing infrastructure security in real estate"
    - "it security issues within the video game industry"
    - "information security plan for flight simulator applications"

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)