Before revision:  This is motivated from computational biology, data protection, and computer security settings, which can be abstracted in terms of two parties, a responder , Alice, who must correctly answer queries of a given type regarding a degree-d tree, T, and a querier , Bob, who issues batches of queries, with each query in a batch being independent of the others, so as to eventually infer the structure of T.
After revision:  This is motivated from computational biology, data protection, and computer security settings, which can be abstracted in terms of two parties, a responder , Alice, who must correctly answer queries of a given type regarding a degree-d tree, T, and a querier , Bob, who issues batches of queries, with each query in a batch being independent of the others, so as to eventually infer the structure of T.