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: "applying formal methods to networking theory techniques and applications"
  Abstract: Despite its great importance, modern network infrastructure is remarkable for the lack of rigor in its engineering. The Internet, which began as a research experiment, was never designed to handle the users and applications it hosts today. The lack of formalization of the Internet architecture meant limited abstractions and modularity, particularly for the control and management planes, thus requiring for every new need a new protocol built from scratch. This led to an unwieldy ossified Internet architecture resistant to any attempts at formal verification and to an Internet culture where expediency and pragmatism are favored over formal correctness. Fortunately, recent work in the space of clean slate Internet design—in particular, the software defined networking (SDN) paradigm—offers the Internet community another chance to develop the right kind of architecture and abstractions. This has also led to a great resurgence in interest of applying formal methods to specification, verification, and synthesis of networking protocols and applications. In this paper, we present a self-contained tutorial of the formidable amount of work that has been done in formal methods and present a survey of its applications to networking.

Connected through hyperedge HE-1 (induced by source paper "a comprehensive survey of interface protocols for software defined networks"):
  with members:
    - "survey on network virtualization hypervisors for software defined networking"
    - "software defined networking a comprehensive survey"
    - "tinynbi distilling an api from essential openflow abstractions"
    - "use of devolved controllers in data center networks"

Connected through hyperedge HE-2 (induced by source paper "a systematic approach to constructing families of incremental topology control algorithms using graph transformation"):
  with members:
    - "a systematic approach to constructing incremental topology control algorithms using graph transformation"
    - "cooperative topology control with adaptation for improved lifetime in wireless sensor networks"
    - "towards the safe programming of wireless sensor networks"

Connected through hyperedge HE-3 (induced by source paper "reliability modeling and analysis of communication networks"):
  with members:
    - "analysis of network coding in a slotted aloha based two way relay network"
    - "formal dependability modeling and analysis a survey"
    - "towards formal fault tree analysis using theorem proving"
    - "towards the formal reliability analysis of oil and gas pipelines"
    - "formal analysis of soft errors using theorem proving"
    - "throughput and latency in finite buffer line networks"

Connected through hyperedge HE-4 (induced by source paper "a systematic approach to constructing incremental topology control algorithms using graph transformation"):
  with members:
    - "model driven development of complex software a research roadmap"

Connected through hyperedge HE-5 (induced by source paper "implementing efficient all solutions sat solvers"):
  with members:
    - "the minimal hitting set generation problem algorithms and computation"
    - "efficient algorithms for dualizing large scale hypergraphs"
    - "the language of search"
    - "conflict directed backjumping revisited"

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.NI(Networking and Internet Architecture)