Which of the following is normal salt ?

${\mathrm{Na}}_3{\mathrm{PO}}_4, {\mathrm{CaSO}}_4 \mathrm{and} {\mathrm{Na}}_2{\mathrm{CO}}_3$ are normal salts due to their structures and formations;

$\mathrm{NaOH}+{\mathrm{H}}_3{\mathrm{PO}}_4\to {\mathrm{Na}}_3{\mathrm{Po}}_4+{\mathrm{H}}_2\mathrm{O}$

${\mathrm{H}}_2{\mathrm{SO}}_4+\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\to {\mathrm{CaSO}}_4+{\mathrm{H}}_2\mathrm{O}$

$\mathrm{NaOH}+{\mathrm{H}}_2{\mathrm{CO}}_3\to {\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{H}}_2\mathrm{O}$