Which one of the following complexes is violet in colour? [JEE Main 2021, 26 Aug (Shift 1)]

\( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \)

\( \left[\mathrm{Fe}(\mathrm{SCN})_{6}\right]^{4-} \)

\( \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3} \cdot \mathrm{H}_{2} \mathrm{O} \)

\( \left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS]}^{4-}\right. \)