Let $EA$ be the electron affinity (energy released on forming $\mathrm{X}{}^{-}$ from $\mathrm{X}$, ignoring the small $RT$ correction). Given that the electron gain enthalpies are $\mathrm{F}$ $-328$, $\mathrm{Cl}$ $-349$, $\mathrm{Br}$ $-325$, $\mathrm{I}$ $-295$ $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$, select the correct statements.

1. AThe energy needed to remove an electron from $\mathrm{Cl}{}^{-}$ is $349\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
2. B$\mathrm{Cl}{}^{-}$ is harder to ionise than $\mathrm{F}{}^{-}$
3. C$\mathrm{I}{}^{-}$ is easier to ionise than $\mathrm{Br}{}^{-}$
4. DThe energy needed to remove an electron from $\mathrm{F}{}^{-}$ is $-328$ $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$