Which of the following brands can all be identified as Cognac?

The correct choice includes Martell, Hennessy, and Rémy Martin, all of which are renowned producers of Cognac. Cognac is a specific type of brandy made from grapes, primarily from the Cognac region of France, and has strict production regulations. Martell, Hennessy, and Rémy Martin are some of the oldest and most well-respected houses within this category, each offering a distinct range of Cognacs that showcase the unique characteristics of the grapes and the terroir of the Cognac region.

The other options fail to present valid choices because they include brands that are either not Cognac or represent entirely different spirit categories. For instance, Château could refer to various wineries but is not a recognized Cognac producer. Glenfiddich is a well-known Scotch whisky brand, while Jameson and Bushmills are both Irish whiskey brands. Thus, they do not belong to the Cognac category. Understanding these distinctions is crucial for anyone looking to specialize in beverages and their classifications.