Which design niche relies solely on CAD applications to develop the prototypes that drive the industry?

Ithink the answer is c

Is there a question?

Perspective is important because it enabled the 3 dimensional world to be translated into the 2d world of the picture plane. this had an immediate impact on the representation of reality in art and design. 

Answer1 string -e (the thinnest)2nd string-b,3 string -g,4th string -d,5th string-a, 6th string- plz check the answer first good luck