Find the (integer) stoichiometry coefficients for the correctly balanced version of the following reaction:
Cr$_2$O$_7^{-2}$(aq) + H$^+$(aq) + I$^-$(aq) ? Cr$^{3+}$(aq) + H$_2$O(l) + I$_3^-$(aq)
2, 1, 7, 1, 1, 5
1, 14, 1, 2, 1, 7
1, 14, 9, 2, 7, 3
1, 14, 1, 1, 1, 7
None of the Above