Which option is correct for curve $a$ and $b$ ?

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Equation for equation for Type of Type of

Curve $(a)$ curve $(b)$ curve $(a)$ curve $(b)$

• A

  $\frac{d N}{d t}=r-N \frac{d N}{d t}=r N\left(\frac{N-K}{K}\right)$ Exponential curve Logistic curve

• B

  $\frac{d N}{d t}=r N \frac{d N}{d t}=r N\left(\frac{K-N}{K}\right)$ Exponential curve Logistic curve

• C

  $\frac{d N}{d t}=r N \frac{d N}{d t}=r N\left(\frac{K-N}{K}\right)$ S-shaped curve J-shaped curve

• D

  Both $(b)$ and $(c)$