B. Photons.
In a photonic material, signal transmission occurs by photons which are light particles.
An isometrical drawing is a nearly 3d drawing showing the object's width and depth in a complete image, from each curved plane of the orthhographic view, the viewpoint is at a 45 degree angle. From an observations point of view, isometric differs, since all longitudes are true.
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mechanism, in mechanical construction, the means employed to transmit and modify motion in a machine or any assemblage of mechanical parts.