What is used to brush the ribeye steak before serving?

The ribeye steak is brushed with margarine before serving to enhance its flavor and add a touch of richness. Margarine has properties that allow it to melt beautifully over the steak, providing a savory finish that complements the meat's natural juiciness. It also helps to create a slightly glossy appearance, which can make the dish more visually appealing.

The other options, while each having their own culinary uses, do not align with the specific practice for ribeye steak at Texas Roadhouse. Olive oil is generally used for seasoning or marinating, but it does not provide the same creamy texture and taste that margarine does when brushed on steak. Butter, though commonly associated with enhancing the flavor of many dishes, is not the choice used for brushing this particular steak. The "None" option does not apply since there is indeed a specific ingredient used in this process.