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: "cup controlled update propagation in peer to peer networks"
  Abstract: Recently the problem of indexing and locating content in peer-to-peer networks has received much attention. Previous work suggests caching index entries at intermediate nodes that lie on the paths taken by search queries, but until now there has been little focus on how to maintain these intermediate caches. This paper proposes CUP, a new comprehensive architecture for Controlled Update Propagation in peer-to-peer networks. CUP asynchronously builds caches of index entries while answering search queries. It then propagates updates of index entries to maintain these caches. Under unfavorable conditions, when compared with standard caching based on expiration times, CUP reduces the average miss latency by as much as a factor of three. Under favorable conditions, CUP can reduce the average miss latency by more than a factor of ten. #R##N#CUP refreshes intermediate caches, reduces query latency, and reduces network load by coalescing bursts of queries for the same item. CUP controls and confines propagation to updates whose cost is likely to be recovered by subsequent queries. CUP gives peer-to-peer nodes the flexibility to use their own incentive-based policies to determine when to receive and when to propagate updates. Finally, the small propagation overhead incurred by CUP is more than compensated for by its savings in cache misses.

Connected through hyperedge HE-1 (induced by source paper "practical load balancing for content requests in peer to peer networks"):
  with members:
    - "narses a scalable flow based network simulator"
    - "enabling the long term archival of signed documents through time stamping"

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)