In an enzyme-catalysed reaction, the Michaelis-Menten constant is written as $K_m$, while the highest reaction velocity is called $V_{max}$. Which of the following statements about $K_m$ and $V_{max}$ is correct?
- AAn enzyme with a high value of $K_m$ can reach its $V_{max}$ at a low substrate concentration.
- BAn enzyme with a high value of $K_m$ has a high affinity to its substrate.
- CAn enzyme with a low value of $K_m$ can reach its $V_{max}$ at a high substrate concentration.
- DAn enzyme with a low value of $K_m$ has a high affinity to its substrate.