Which type of mailpiece requires at least 3 tabs for fastening?

The correct answer identifies that a booklet-type mailpiece requires at least three tabs for fastening. Booklets are typically comprised of multiple pages, and proper fastening is essential to ensure that all pages are held together securely during mailing. The use of tabs helps in maintaining the integrity of the booklet, preventing it from unfolding or losing pages in transit.

Each tab acts as a secure point, keeping the booklet compact and protected while it goes through various processing stages in postal facilities. The requirement for three tabs specifically ensures that booklets can withstand handling without compromising the attached pages, making it a crucial part of mail preparation for this type of item. This practice follows postal regulations to ensure efficient sorting and delivery, thereby minimizing delays due to damaged or improperly secured mailpieces.

Other types of mail, such as parcel post or marketing mail flat-sized pieces, have different fastening requirements or may not need tabs at all, depending on their structure and mailing standards.