GMAT Sentence Correction (SC) | which one is correct & why?

1.James created a magnificent design by using latest graphic design tools, a work acknowledged and appreciated by all investors.
2.James created a magnificent design by using latest graphic design tools, an experiment that many feared to do because of the instability in the output resulting from these tools.
3.James created a magnificent design by using latest graphic design tools, expensive but super helpful devices developed especially for minute detailing and elaboration.

which one is correct
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