Which statement is true about the aspect ratio requirement for mailpieces?

The statement regarding the aspect ratio requirement for mailpieces being between 1.3 and 2.5 is accurate because the aspect ratio is defined as the ratio of the longest side of a mailpiece to the shortest side. This range is set to ensure that mailpieces can be processed efficiently within postal systems. An aspect ratio below 1.3 indicates a more square configuration, which could cause issues with sorting, while anything above 2.5 leads to long, narrow shapes that may not fit standard sorting equipment effectively. By adhering to a ratio within this specified range, mailpieces are more likely to be compatible with postal handling and automation processes, ensuring timely delivery and operational efficiency.