Which of the following is NOT a feature of iced tea at Dunkin Donuts?

The option indicating that iced tea is served hot is indeed not a feature of iced tea at Dunkin Donuts. Iced tea, by definition, is brewed tea that is cooled and served over ice, making it a refreshing beverage particularly suited for warm weather or as a chilled option.

In contrast to this, the other features provided highlight the various offerings of Dunkin's iced tea. Iced tea can be sweetened, catering to customer preferences for sweetness. The menu typically includes not only regular black tea but also a variety of flavored iced teas. This variety allows customers to choose based on their taste preferences. Thus, the focus on iced tea being a cold beverage and not served hot aligns with common practice in beverage offerings and customer expectations.