Which of the following observations is found in the Tollens' test for aldehydes?
- AThe formation of a pink or magenta color upon the addition of the reagent to the sample solution.
- BFormation of an $Ag$ layer on the sides of the test tube upon addition and warming of the reagent.
- CFormation of a brick-red precipitate upon heating with the reagent.
- DAppearance of a red color upon shaking with the reagent.
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