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: "preserving peer replicas by rate limited sampled voting"
  Abstract: The LOCKSS project has developed and deployed in a world-wide test a peer-to-peer system for preserving access to journals and other archival information published on the Web. It consists of a large number of independent, low-cost, persistent web caches that cooperate to detect and repair damage to their content by voting in ``opinion polls.'' Based on this experience, we present a design for and simulations of a novel protocol for voting in systems of this kind. It incorporates rate limitation and intrusion detection in new ways that ensure even an adversary capable of unlimited effort over decades has only a small probability of causing irrecoverable damage before being detected.

Connected through hyperedge HE-1 (induced by source paper "archive assisted archival fixity verification framework"):
  with members:
    - "mementomap framework for flexible and adaptive web archive profiling"
    - "difficulties of timestamping archived web pages"
    - "making digital artifacts on the web verifiable and reliable"
    - "decentralized trusted timestamping using the crypto currency bitcoin"
    - "trusty uris verifiable immutable and permanent digital artifacts for linked data"
    - "http mailbox asynchronous restful communication"
    - "memento time travel for the web"

Connected through hyperedge HE-2 (induced by source paper "a distributed integrity catalog for digital repositories"):
  with members:
    - "secure history preservation through timeline entanglement"

Connected through hyperedge HE-3 (induced by source paper "attrition defenses for a peer to peer digital preservation system"):
  with members:
    - "active internet traffic filtering real time response to denial of service attacks"
    - "narses a scalable flow based network simulator"

Connected through hyperedge HE-4 (induced by source paper "2 p2p or not 2 p2p"):
  with members:
    - "observation based cooperation enforcement in ad hoc networks"
    - "secure history preservation through timeline entanglement"

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.DC(Distributed, Parallel, and Cluster Computing)