$4-$This ratio is considered a good indicator of a company's growth potential, as it shows the company's net income relative to its total equity investment. Find what ratio this definition belongs to$.$

a$-$ Price to Earnings $($P$/$E$)$ Ratio

b$-$Debt to Equity Ratio

c$-$Earning per Share Ratio$($EPS$)$

d$-$ Return on Equity $($ROE$)$ Ratio