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: "exploring time flexibility in wireless data plans"
  Abstract: Recently, the mobile network operators (MNOs) are exploring more time flexibility with the rollover data plan, which allows the unused data from the previous month to be used in the current month. Motivated by this industry trend, we propose a general framework for designing and optimizing the mobile data plan with time flexibility. Such a framework includes the traditional data plan, two existing rollover data plans, and a new credit data plan as special cases. Under this framework, we formulate a monopoly MNO's optimal data plan design as a three-stage Stackelberg game: In Stage I, the MNO decides the data mechanism; In Stage II, the MNO further decides the corresponding data cap, subscription fee, and the per-unit fee; Finally in Stage III, users make subscription decisions based on their own characteristics. Through backward induction, we analytically characterize the MNO's profit-maximizing data plan and the corresponding users' subscriptions. Furthermore, we conduct a market survey to estimate the distribution of users' two-dimensional characteristics, and evaluate the performance of different data mechanisms using the real data. We find that a more time-flexible data mechanism increases MNO's profit and users' payoffs, hence improves the social welfare.

Connected through hyperedge HE-1 (induced by source paper "multi cap optimization for wireless data plans with time flexibility"):
  with members:
    - "duopoly competition for mobile data plans with time flexibility"
    - "economic viability of data trading with rollover"
    - "a novel mobile data contract design with time flexibility"
    - "on optimal two sided pricing of congested networks"
    - "economic analysis of crowdsourced wireless community networks"
    - "an integrated spectrum and information market for green cognitive communications"
    - "the role of data cap in optimal two part network pricing"
    - "a survey of smart data pricing past proposals current plans and future trends"

Connected through hyperedge HE-2 (induced by source paper "duopoly competition for mobile data plans with time flexibility"):
  with members:
    - "economic viability of data trading with rollover"
    - "a novel mobile data contract design with time flexibility"
    - "an integrated spectrum and information market for green cognitive communications"
    - "the role of data cap in optimal two part network pricing"
    - "time and location aware mobile data pricing"
    - "mine gold to deliver green cognitive communications"
    - "economic viability of paris metro pricing for digital services"
    - "a survey of smart data pricing past proposals current plans and future trends"

Connected through hyperedge HE-3 (induced by source paper "economic viability of data trading with rollover"):
  with members:
    - "a novel mobile data contract design with time flexibility"
    - "mobile data trading behavioral economics analysis and algorithm design"
    - "time and location aware mobile data pricing"
    - "a survey of smart data pricing past proposals current plans and future trends"

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.GT(Computer Science and Game Theory)