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The icon displayed to the right of the legend title is Tableau's highlighting control. Therefore, clicking it controls legend highlighting, making C the correct answer. Legend highlighting is an interactive analytical feature that allows the viewer to focus on specific marks associated with a selected legend member. When highlighting is enabled and a value such as Business Class or First Class is selected, Tableau emphasizes the corresponding marks while visually dimming unrelated marks. This makes it possible to investigate one category without filtering other categories out of the visualization. Tableau supports both one-way and two-way legend highlighting. The icon displayed at the top of the legend indicates the available highlighting mode. In two-way highlighting, interaction can occur from either the legend or marks in the visualization. The Edit Colors command is accessed through the legend's menu or other color controls, not by clicking this highlighter icon. Likewise, the icon does not expose filter settings and does not hide or display the legend itself. Official Tableau documentation explicitly states that the icon at the top of the legend represents legend highlighting and can be used to control highlighting behavior.

The correct configuration is Logical tables that use a single table extract, making C correct. In Tableau's data model, a union operates in the physical layer. The two unioned physical tables are merged into one resulting logical table. Tableau explicitly describes logical tables as containers that can contain multiple physical tables joined or unioned together. When an extract is stored using Logical Tables, Tableau creates one extract table for each logical table in the data source. Because the scenario contains one logical table composed of the two unioned physical tables, the extract is consequently represented as a single extract table. This is different from using Physical Tables storage. Physical storage retains an extract table for each physical table and is subject to additional eligibility restrictions. Tableau's current terminology replaced the older "Single Table" and "Multiple Tables" extract terminology with Logical Tables and Physical Tables, respectively. Official Tableau documentation states that physical tables joined or unioned inside a logical table are merged as part of that logical table, and that Logical Tables extract storage creates one extract table per logical table. Therefore, a two-table union forming one logical table corresponds to a logical/single-table extract structure.