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: "efficient synchronous byzantine consensus"
  Abstract: We present new protocols for Byzantine state machine replication and Byzantine agreement in the synchronous and authenticated setting. The celebrated PBFT state machine replication protocol tolerates $f$ Byzantine faults in an asynchronous setting using $3f+1$ replicas, and has since been studied or deployed by numerous works. In this work, we improve the Byzantine fault tolerance threshold to $n=2f+1$ by utilizing a relaxed synchrony assumption. We present a synchronous state machine replication protocol that commits a decision every 3 rounds in the common case. The key challenge is to ensure quorum intersection at one honest replica. Our solution is to rely on the synchrony assumption to form a post-commit quorum of size $2f+1$, which intersects at $f+1$ replicas with any pre-commit quorums of size $f+1$. Our protocol also solves synchronous authenticated Byzantine agreement in expected 8 rounds. The best previous solution (Katz and Koo, 2006) requires expected 24 rounds. Our protocols may be applied to build Byzantine fault tolerant systems or improve cryptographic protocols such as cryptocurrencies when synchrony can be assumed.

Connected through hyperedge HE-1 (induced by source paper "on probabilistic byzantine fault tolerance"):
  with members:
    - "stakedag stake based consensus for scalable trustless systems"
    - "fantom a scalable framework for asynchronous distributed systems"
    - "practical synchronous byzantine consensus"
    - "randomized protocols for asynchronous consensus"

Connected through hyperedge HE-2 (induced by source paper "scalable and probabilistic leaderless bft consensus through metastability"):
  with members:
    - "the latest gossip on bft consensus"
    - "scaling nakamoto consensus to thousands of transactions per second"
    - "practical synchronous byzantine consensus"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "bitcoin ng a scalable blockchain protocol"
    - "epidemic thresholds with external agents"

Connected through hyperedge HE-3 (induced by source paper "repchain a reputation based secure fast and high incentive blockchain system via sharding"):
  with members:
    - "towards scaling blockchain systems via sharding"
    - "practical synchronous byzantine consensus"
    - "enhancing bitcoin security and performance with strong consistency via collective signing"
    - "xft practical fault tolerance beyond crashes"
    - "bitcoin ng a scalable blockchain protocol"
    - "centrally banked cryptocurrencies"

Connected through hyperedge HE-4 (induced by source paper "a permit based optimistic byzantine ledger"):
  with members:
    - "proteus a scalable bft consesus protocol for blockchains"
    - "the latest gossip on bft consensus"
    - "hotstuff bft consensus in the lens of blockchain"
    - "correction to byzantine agreement in expected polynomial time jacm 2016"
    - "sbft a scalable decentralized trust infrastructure for blockchains"
    - "practical synchronous byzantine consensus"

Connected through hyperedge HE-5 (induced by source paper "byzantine consensus in the common case"):
  with members:
    - "practical synchronous byzantine consensus"
    - "byzantine agreement with optimal early stopping optimal resilience and polynomial complexity"
    - "knowledge and common knowledge in a distributed environment"

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)