3D spray still is used even be the very professionals in some situation just to preserve the proper accuracy especially on a very contrasting color objects when using any type of light based scanners. For example half is white the other metallic or black to avoid false relief side effect.
So my answer would be C and D but for the sake of the game it is definitely D cart.
I agree with @PUTV. Carts A and B are definitely out because no marker dots are needed. For the purpose of the game I believe cart D is the answer that is being sought, but cart C gives the buyer more options for scanning difficult surfaces like clear or shiny red, so cart C should give the best overall experience with Trackit.
Not needed but still usable if you want to capture full scan of a car at once and want to scan in sections , you need 5 markers on the boarders to keep tracking the sections if you pause the scanning when moving tracker to a new position if nesesery. Or you want to get standalone scanning without a tracker .
Lots of possibilities to make things so much easier.
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