The correct variation of the following properties of group 1 elements (M) ( \(\mathrm{Li}\) to Cs) is :

1. A \(\begin{array}{|l|l|l|}
   \hline \begin{array}{l}
   \text { Hydration } \\
   \text { enthalpy of } \mathrm{M}^{+}
   \end{array} & \begin{array}{l}
   \text { Ionization } \\
   \text { enthalpy of } \mathrm{M}
   \end{array} & \begin{array}{l}
   \text { Melting } \\
   \text { point of } \mathrm{M}
   \end{array} \\
   \hline \text { increases } & \text { increases } & \text { increases } \\
   \hline
   \end{array}\)
2. B \(\begin{array}{|l|l|l|}
   \hline \begin{array}{l}
   \text { Hydration } \\
   \text { enthalpy of } \mathrm{M}^{+}
   \end{array} & \begin{array}{l}
   \text { Ionization } \\
   \text { enthalpy of } \mathrm{M}
   \end{array} & \begin{array}{l}
   \text { Melting } \\
   \text { point of } \mathrm{M}
   \end{array} \\
   \hline \text { decreases } & \text { decreases } & \text { decreases } \\
   \hline
   \end{array}\)
3. C \(\begin{array}{|l|l|l|}
   \hline \begin{array}{l}
   \text { Hydration } \\
   \text { enthalpy of } \mathrm{M}^{+}
   \end{array} & \begin{array}{l}
   \text { Ionization } \\
   \text { enthalpy of } \mathrm{M}
   \end{array} & \begin{array}{l}
   \text { Melting } \\
   \text { point of } \mathrm{M}
   \end{array} \\
   \hline \text { decreases } & \text { decreases } & \text { increases } \\
   \hline
   \end{array}\)
4. D \(\begin{array}{|l|l|l|}
   \hline \begin{array}{l}
   \text { Hydration } \\
   \text { enthalpy of } \mathrm{M}^{+}
   \end{array} & \begin{array}{l}
   \text { Ionization } \\
   \text { enthalpy of } \mathrm{M}
   \end{array} & \begin{array}{l}
   \text { Melting } \\
   \text { point of } \mathrm{M}
   \end{array} \\
   \hline \text { increases } & \text { decreases } & \text { decreases } \\
   \hline
   \end{array}\)