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When a reagent \( (X) \) reacts with \( \mathrm{Fe}^{3+} \) salt solution turns red due to the formation of a compound \( (Y) \). This reagent causes no change in colour with \( \mathrm{Fe}^{2+} \) salt solution. Compound \( (X) \) and \( (Y) \) are respectively :
(a) \( \mathrm{NH}_{4} \mathrm{SCN} \) and \( \mathrm{Fe}(\mathrm{SCN})_{3} \)
(b) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \) and \( \mathrm{FeSO}_{4} \)
(c) \( \mathrm{Na}_{2} \mathrm{HPO}_{4} \) and \( \mathrm{FeSO}_{4} \)
(d) \( \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \) and \( \mathrm{K}_{2} \mathrm{Fe}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
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