Chemical Bonding And Molecular Structure

The number of species from the following that have pyramidal geometry around the central atom is _________

\(\mathrm{S}_2 \mathrm{O}_3^{2-}, \mathrm{SO}_4^{2-}, \mathrm{SO}_3^{2-}, \mathrm{S}_2 \mathrm{O}_7^{2-}\)