Which one of the following statements is $CORRECT$ for enzyme catalyzed reactions? ( $\Delta G$ is Gibbs free energy change, $K_{eq}$ is equilibrium constant)

1. Enzymes affect $\Delta G$, but not $K_{eq}$
2. Enzymes affect $K_{eq}$, but not $\Delta G$
3. Enzymes affect both $\Delta G$ and $K_{eq}$
4. Enzymes do not affect $\Delta G$ or $K_{eq}$