What design utilizes longerons and struts welded at various angles for a wing's basic shape?

The truss design is characterized by the use of longerons and struts that are arranged in a framework to provide structural support for the wings of an aircraft. This design relies on the principle of triangulation to distribute loads, which enhances the strength and stability of the wing structure without significantly increasing its weight. The longerons serve as the main longitudinal supports, while the struts, which are often positioned at various angles, connect these longerons and effectively manage the forces experienced during flight.

In contrast, the monocoque design employs a shell-like structure that distributes stress across the entire surface rather than relying on an internal framework, making it less applicable to the question. The semimonocoque design is similar to the monocoque but adds additional structural elements for enhanced strength, again not fitting the description provided. The turboprop design refers specifically to a type of propulsion system rather than the structural design of the wings. Thus, the truss design is the only option that correctly describes the use of longerons and struts welded at various angles to create the wing's basic shape.