Which term indicates that a wine has residual sugar?

The presence of residual sugar in wine is indicated by various terms depending on the amount of sweetness perceived. In wine terminology, "dry" generally describes wines that contain little to no residual sugar, meaning they do not taste sweet. However, wines labeled as "off-dry" have a noticeable but not overwhelming amount of residual sugar, providing a hint of sweetness. Finally, "sweet" specifically refers to wines that have a significant level of residual sugar, resulting in an overtly sweet taste.

Given that each term relates to the level of residual sugar in wine, the correct answer encompasses all these categories, acknowledging that they represent varying degrees of sweetness. Thus, "All of the above" captures that residual sugar can be reflected in different ways across a spectrum of sweetness in wines.