Final answer:
Option A). Gusset plates used on wood or floor trusses are either plywood or metal, chosen based on the structural requirements of the trusses. Plywood offers flexibility, while metal provides a high strength-to-weight ratio.
Step-by-step explanation:
Plywood or metal gusset plates are the types used on floor trusses and wood. Plywood gusset plates are strong and flexible, made from multiple layers of wood veneer, and can be used to join different wood members of trusses. Conversely, metal gusset plates—which are typically composed of steel—offer a high strength-to-weight ratio and are necessary for connections that require a sizable load-bearing capacity. Depending on the intricacy and specifications of the truss design, stamped and fabricated metal gusset plates can be further classified.