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A chemist has 4 samples of artificial sw...

A chemist has 4 samples of artificial sweetener, A,B,C and D. To identify these samples, he performed certain experiments and noted the following observations.
(i) A and D both form blue-violent colour with ninhydrin.
(ii) Lassaigne extract of C gives positive `AgNO_(3)` test and negative `Fe_(4)[Fe(CN)_(6)]_(3)` test.
(iii) Lassaigne extract of B and D gives positive sodium nitroprusside test.
Based on these observations which option is correct?

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