Which statement is true about stationary fronts?

Stationary fronts are characterized by a boundary between two air masses that remain relatively unchanged in position over time. This lack of significant movement is what defines them, as opposed to moving fronts, which actively shift and alter the weather conditions in their vicinity. The primary feature of a stationary front is that it can lead to prolonged periods of similar weather conditions, which can result in extended cloud cover and precipitation without the dramatic changes that accompany more dynamic fronts.

The other options do not accurately describe stationary fronts. For instance, while extreme weather can occur with various types of fronts, stationary fronts themselves do not inherently lead to such events. They are not confined to being cold fronts, as stationary fronts can involve warm and cold air masses interacting without clear movement in either direction. Lastly, stationary fronts do not result from warm fronts overtaking cold fronts; such a scenario typically describes a different kind of front interaction altogether, rather than the unique and static nature of a stationary front.