What is a key characteristic of rocks drinks?

The correct choice highlights a defining feature of rocks drinks, which are typically served over ice in a short glass, commonly referred to as an "old-fashioned" or "rocks" glass. The glass is intended to hold the drink’s ingredients while allowing them to be chilled without diluting them significantly, as the ice will melt gradually.

Rocks drinks are generally enjoyed straight without mixers, or with minimal dilution, thus supporting the preference for the short straw to savor the drink as it is consumed. The use of ice, while present, is more about maintaining the temperature and enhancing flavor profiles, rather than the act of mixing or aerating the drink, which would not align with the product's nature. This offers a drinking experience that focuses on the spirit's flavor and characteristics rather than complicated mixtures.

In contrast, other choices such as being served in a tall glass or mixed with tonic water do not accurately represent the traditional presentation and preparation methods associated with rocks drinks. Shaking for aeration is also not typical, as most rocks drinks are simply poured over ice.