A solution X, on mixing with AgNO\(_3\) solution gives a white precipitate soluble in aqueous NH\(_3\), a solution Y, when also added to X, also gives a white precipitate which is soluble when heated solutions X and Y respectively contain

• A Al\(^{3+}\), Cl\(^-\)
• B Hg\(^+\), SO\(_4 ^{2-}\)
• C Pb\(^{2+}\), Cl\(^-\)
• D Ag\(^+\), SO\(_4 ^{2-}\)