Which chevron has three stripes and is distinguished by a star?

The correct answer is the one that represents a technical sergeant in the Air Force. The technical sergeant rank is denoted by three chevrons with a star above them. This insignia distinguishes technical sergeants from other ranks and signifies their level of responsibility and leadership within the Air Force.

Understanding rank insignias is critical in the military as they indicate not only the hierarchy but also the experience and qualifications of the personnel. In this case, the presence of three stripes and a star is a clear identifier of a technical sergeant's rank, which plays an essential role in the day-to-day operations and leadership structure of the Air Force.

The other ranks listed do not have this specific insignia configuration, which sets the technical sergeant apart in visual identification.