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: "network functions virtualization architecture for gateways for virtualized wireless sensor and actuator networks"
  Abstract: Virtualization enables multiple applications to share the same WSAN. However, in heterogeneous environments, VWSANs raise new challenges, such as the need for on-the-fly, dynamic, elastic, and scalable provisioning of gateways. NFV is a paradigm emerging to help tackle these new challenges. It leverages standard virtualization technology to consolidate special-purpose network elements on commodity hardware. This article presents NFV architecture for VWSAN gateways, in which software instances of gateway modules are hosted in NFV infrastructure operated and managed by a VWSAN gateway provider. We consider several VWSAN providers, each with its own brand or combination of brands of sensors and actuators/ robots. These sensors and actuators can be accessed by a variety of applications, each of which may have different interface and QoS (latency, throughput, etc.) requirements. The NFV infrastructure allows dynamic, elastic, and scalable deployment of gateway modules in this heterogeneous VWSAN environment. Furthermore, the proposed architecture is flexible enough to easily allow integration of new sensors and actuators, and accommodation of new application domains. We present a prototype that is built using the OpenStack platform. Performance results are also discussed.

Connected through hyperedge HE-1 (induced by source paper "application component placement in nfv based hybrid cloud fog systems with mobile fog nodes"):
  with members:
    - "on reducing iot service delay via fog offloading"
    - "application component placement in nfv based hybrid cloud fog systems"
    - "a comprehensive survey on fog computing state of the art and research challenges"
    - "network function virtualization state of the art and research challenges"

Connected through hyperedge HE-2 (induced by source paper "nfv and sdn based distributed iot gateway for large scale disaster management"):
  with members:
    - "robots as a service in cloud computing search and rescue in large scale disasters case study"
    - "network function virtualization state of the art and research challenges"
    - "wireless sensor network virtualization a survey"
    - "wireless sensor network virtualization early architecture and research perspectives"

Connected through hyperedge HE-3 (induced by source paper "robots as a service in cloud computing search and rescue in large scale disasters case study"):
  with members:
    - "a coalition formation algorithm for multi robot task allocation in large scale natural disasters"
    - "getting virtualized wireless sensor networks iaas ready for paas"
    - "internet of things iot a vision architectural elements and future directions"

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)