According to our reading, which of the following statements is true?Page $3$:a$)$ The potential gain from performing field research is much more than early prototype testingb$)$ There is a significant increase in profit potential from early prototype testing over field researchPage $4$:c$)$ The gain from performing early prototype testing is much more than fieldresearchPage $5$:$5$Page $6$:d$)$ There is a only a slight increase in profit potential from doing field research over early prototype testing