If a firm's ROA$($ROI$)$ is $12\%,$ and the firm has no preferred stock financing, it is

possible that its return on stockholders' equity is $21\%.$

impossible for its debt$-$to$-$equity ratio to be $1\mathrm{.}0.$

impossible for its net profit margin to be $9\%.$

possible that its ret$$ on stockholders' equity is $5\%.$