Among the following, the Arrhenius base is

According to Arrhenius theory which substance produce ${\mathrm{OH}}^{-}$ ions it is called Arrhenius base.

$\mathrm{Al}{\left(\mathrm{OH}\right)}_3$

$\mathrm{Al}{{\left(\mathrm{OH}\right)}_3}_{\left(\mathrm{aq}\right)}\rightleftharpoons {\mathrm{Al}}^{+3}+3{\mathrm{OH}}^{-}$