Select the best answer or answers from the choices given: All of the following descriptions refer to dorsal column–medial lemniscal ascending pathways except one: (a) they include the fasciculus gracilis and fasciculus cuneatus; (b) they include a chain of three neurons; (c) their connections are diffuse and poorly localized; (d) they are concerned with precise transmission of one or a few related types of sensory input.

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