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: "stratos a network aware orchestration layer for virtual middleboxes in clouds"
  Abstract: Enterprises want their in-cloud services to leverage the performance and security benefits that middleboxes offer in traditional deployments. Such virtualized deployments create new opportunities (e.g., flexible scaling) as well as new challenges (e.g., dynamics, multiplexing) for middlebox management tasks such as service composition and provisioning. Unfortunately, enterprises lack systematic tools to efficiently compose and provision in-the-cloud middleboxes and thus fall short of achieving the benefits that cloud-based deployments can offer. To this end, we present the design and implementation of Stratos, an orchestration layer for virtual middleboxes. Stratos provides efficient and correct composition in the presence of dynamic scaling via software-defined networking mechanisms. It ensures efficient and scalable provisioning by combining middlebox-specific traffic engineering, placement, and horizontal scaling strategies. We demonstrate the effectiveness of Stratos using an experimental prototype testbed and large-scale simulations.

Connected through hyperedge HE-1 (induced by source paper "online joint placement and allocation of virtual network functions with heterogeneous servers"):
  with members:
    - "joint placement and allocation of virtual network functions with budget and capacity constraints"
    - "shortest path and maximum flow problems under service function chaining constraints"
    - "provably efficient algorithms for joint placement and allocation of virtual network functions"
    - "approximate and incremental network function placement"

Connected through hyperedge HE-2 (induced by source paper "snf serverless network functions"):
  with members:
    - "cloud programming simplified a berkeley view on serverless computing"
    - "occupy the cloud distributed computing for the 99"
    - "correctness and performance for stateful chained network functions"

Connected through hyperedge HE-3 (induced by source paper "dynamic placement of vnf chains for proactive caching in mobile edge networks"):
  with members:
    - "network function virtualization state of the art and research challenges"
    - "efficient proactive caching for supporting seamless mobility"

Connected through hyperedge HE-4 (induced by source paper "software defined multi cloud computing a vision architectural elements and future directions"):
  with members:
    - "a taxonomy and survey of energy efficient data centers and cloud computing systems"

Connected through hyperedge HE-5 (induced by source paper "provably efficient algorithms for joint placement and allocation of virtual network functions"):
  with members:
    - "software defined networking a comprehensive survey"

Connected through hyperedge HE-6 (induced by source paper "on orchestrating virtual network functions in nfv"):
  with members:
    - "software defined networking a comprehensive survey"
    - "specifying and placing chains of virtual network functions"

Connected through hyperedge HE-7 (induced by source paper "accelerating the development of software defined network optimization applications using sol"):
  with members:
    - "merlin a language for provisioning network resources"

Connected through hyperedge HE-8 (induced by source paper "software defined cloud computing architectural elements and open challenges"):
  with members:
    - "cloud based augmentation for mobile devices motivation taxonomies and open challenges"
    - "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)