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: "state of the art in power line communications from the applications to the medium"
  Abstract: In recent decades, power line communication (PLC) has attracted considerable attention from the research community and industry, as well as from regulatory and standardization bodies. In this paper, we provide an overview of both narrowband and broadband systems, covering potential applications, regulatory and standardization efforts, and recent research advancements in channel characterization, physical layer performance, medium access, and higher layer specifications and evaluations. We also identify the areas of current and further study that will enable the continued success of PLC technology.

Connected through hyperedge HE-1 (induced by source paper "your noise my signal exploiting switching noise for stealthy data exfiltration from desktop computers"):
  with members:
    - "high efficiency power side channel attack immunity using noise injection in attenuated signature domain"
    - "no free charge theorem a covert channel via usb charging cable on mobile devices"
    - "fansmitter acoustic data exfiltration from speakerless air gapped computers"
    - "bitwhisper covert signaling channel between air gapped computers using thermal manipulations"
    - "on covert acoustical mesh networks in air"

Connected through hyperedge HE-2 (induced by source paper "a survey of limitations and enhancements of the ipv6 routing protocol for low power and lossy networks a focus on core operations"):
  with members:
    - "a comparative performance study of the routing protocols rpl loadng and loadng ctp with bidirectional traffic for ami scenario"
    - "multiple redundancy constants with trickle"
    - "adaptive broadcast suppression for trickle based protocols"
    - "wireless sensors networks for internet of things"

Connected through hyperedge HE-3 (induced by source paper "on the capacity of mimo broadband power line communications channels"):
  with members:
    - "on the capacity of narrowband plc channels"
    - "a novel approach to the statistical modeling of wireline channels"

Connected through hyperedge HE-4 (induced by source paper "throughput analysis for wavelet ofdm in broadband power line communications"):
  with members:
    - "uplink fbmc oqam based multiple access channel distortion analysis under strong frequency selectivity"

Connected through hyperedge HE-5 (induced by source paper "novel grid topology estimation technique exploiting plc modems"):
  with members:
    - "on the exploitation of admittance measurements for wired network topology derivation"

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)