Exponential Growth of a Population Is Represented by DN/dt = $\frac{r N}{K}$

Exponential growth of a population is represented by dN/dt =

A) $\frac{r N}{K}$

B) rN

C) rN (K + N)

D) $r N \frac{(K-N) }{K}$

E) $r N \frac{(N-K) }{K}$