Respuesta :
The only option that is a true representation of the definition of trusses is;
Option A; A structure made up of one or more triangular units, connected at the joints by long beams
In structural mechanics, there is what we call trusses which is simply a structure that consists of members organised into connected triangles in such a way that the overall assembly behaves like a single object.
These are used when roof members are to be made of steel, also used in bridges.
Looking at the options, the only one that is a true representation of the definition of trusses is Option A.
Learn more about trusses at; https://brainly.com/question/12937335
A.) Structure made up of one or more triangular units, connected at the joints by long beams.
Hope this helps, don't forget brainliest :)