An enzyme catalyses $\mathrm{S}\rightleftharpoons \mathrm{P}$ with $\Delta G=-12\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ at $300\mathrm{K}$. Select the correct statements.

1. A$\Delta G$ of the reaction is still $-12\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ in the presence of the enzyme.
2. BThe equilibrium constant increases because the activation energy is lowered.
3. CThe reverse reaction $\mathrm{P}\to \mathrm{S}$ is also accelerated.
4. DThe enzyme is permanently consumed as the reaction proceeds.