One complete reaction of \(\mathrm{FeCl}_3\) with oxalic acid in aqueous solution containing \(\mathrm{KOH}\), resulted …

One complete reaction of \(\mathrm{FeCl}_3\) with oxalic acid in aqueous solution containing \(\mathrm{KOH}\), resulted in the formation of product A. The secondary valency of \(\mathrm{Fe}\) in the product \(\mathrm{A}\) is ____ (Round off to the Nearest Integer).

[JEE Main 2021, 17 Mar (Shift 2)]