Hydrogen And It'S Compounds

In aqueous solution, the hydronium ion ( ) can get further hydrated to form various hydrated species. Among the options provided, the species that forms is:$ \mathrm{H}_9 \mathrm{O}_4^{+}+$, represents a hydronium ion that is surrounded by three water molecules, forming a more complex hydrated structure often referred to as the "Eigen cation".