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: "further hardness results on rainbow and strong rainbow connectivity"
  Abstract: A path in an edge-colored graph is rainbow if no two edges of it are colored the same. The graph is said to be rainbow connected if there is a rainbow path between every pair of vertices. If there is a rainbow shortest path between every pair of vertices, the graph is strong rainbow connected. We consider the complexity of the problem of deciding if a given edge-colored graph is rainbow or strong rainbow connected. These problems are called Rainbow connectivity and Strong rainbow connectivity, respectively. We prove both problems remain NP -complete on interval outerplanar graphs and k -regular graphs for k ? 3 . Previously, no graph class was known where the complexity of the two problems would differ. We show that for block graphs, which form a subclass of chordal graphs, Rainbow connectivity is NP -complete while Strong rainbow connectivity is in P . We conclude by considering some tractable special cases, and show for instance that both problems are in XP when parameterized by tree-depth.

Connected through hyperedge HE-1 (induced by source paper "algorithms and bounds for very strong rainbow coloring"):
  with members:
    - "on the fine grained complexity of rainbow coloring"
    - "on the complexity of rainbow coloring problems"
    - "computing minimum rainbow and strong rainbow colorings of block graphs"
    - "rainbow colouring of split and threshold graphs"

Connected through hyperedge HE-2 (induced by source paper "complexity of rainbow vertex connectivity problems for restricted graph classes"):
  with members:
    - "on the complexity of rainbow coloring problems"

Connected through hyperedge HE-3 (induced by source paper "on the complexity of rainbow coloring problems"):
  with members:
    - "rainbow colouring of split and threshold graphs"

Connected through hyperedge HE-4 (induced by source paper "computing minimum rainbow and strong rainbow colorings of block graphs"):
  with members:
    - "rainbow colouring of split graphs"
    - "rainbow colouring of split and threshold graphs"
    - "note on the complexity of deciding the rainbow connectedness for bipartite graphs"

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.CC(Computational Complexity)