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: "cloud services brokerage a survey and research roadmap"
  Abstract: A Cloud Services Brokerage (CSB) acts as an intermediary between cloud service providers (e.g., Amazon and Google) and cloud service end users, providing a number of value adding services. CSBs as a research topic are in there infancy. The goal of this paper is to provide a concise survey of existing CSB technologies in a variety of areas and highlight a roadmap, which details five future opportunities for research.

Connected through hyperedge HE-1 (induced by source paper "don t wait to be breached creating asymmetric uncertainty of cloud applications via moving target defenses"):
  with members:
    - "clouns a cloud native application reference model for enterprise architects"
    - "tailored source code transformations to synthesize computationally diverse program variants"

Connected through hyperedge HE-2 (induced by source paper "cloud brokerage a systematic survey"):
  with members:
    - "price and performance of cloud hosted virtual network functions analysis and future challenges"
    - "same same but different a descriptive differentiation of intra cloud iaas services"
    - "daleel simplifying cloud instance selection using machine learning"
    - "socloud a service oriented component based paas for managing portability provisioning elasticity and high availability across multiple clouds"
    - "container based cloud virtual machine benchmarking"
    - "academic cloud computing research five pitfalls and five opportunities"
    - "experiences of using a hybrid cloud to construct an environmental virtual observatory"
    - "vm mad a cloud cluster software for service oriented academic environments"

Connected through hyperedge HE-3 (induced by source paper "about being the tortoise or the hare a position paper on making cloud applications too fast and furious for attackers"):
  with members:
    - "clouns a cloud native application reference model for enterprise architects"

Connected through hyperedge HE-4 (induced by source paper "next generation cloud computing new trends and research directions"):
  with members:
    - "occupy the cloud distributed computing for the 99"
    - "on using micro clouds to deliver the fog"
    - "multi tenant virtual gpus for optimising performance of a financial risk application"
    - "big graph search challenges and techniques"
    - "cloudrone micro clouds in the sky"
    - "acceleration as a service exploiting virtualised gpus for a financial application"
    - "big data computing and clouds"
    - "sla oriented resource provisioning for cloud computing challenges architecture and solutions"

Connected through hyperedge HE-5 (induced by source paper "doclite a docker based lightweight cloud benchmarking tool"):
  with members:
    - "analysis of docker security"
    - "an introduction to docker for reproducible research with examples from the r environment"
    - "academic cloud computing research five pitfalls and five opportunities"
    - "cloud benchmarking for performance"
    - "parallel simulations for analysing portfolios of catastrophic event risk"
    - "on a catalogue of metrics for evaluating commercial cloud services"

Connected through hyperedge HE-6 (induced by source paper "on mobile cloud for smart city applications"):
  with members:
    - "from participatory sensing to mobile crowd sensing"
    - "sensing as a service model for smart cities supported by internet of things"
    - "mobile cloud computing a comparison of application models"

Connected through hyperedge HE-7 (induced by source paper "daleel simplifying cloud instance selection using machine learning"):
  with members:
    - "defining cross cloud systems"
    - "experiences of using a hybrid cloud to construct an environmental virtual observatory"

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)