Which action represents proper aliquot preparation?

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Proper aliquot preparation centers on keeping the sample contained and uncontaminated while minimizing splash and aerosol risk. The best practice is to cover or cap the aliquot tube immediately after transferring the sample, sealing it to prevent contamination, evaporation, or exposure. Removing the stopper behind a splash shield increases the chance of exposure and aerosol generation, making it unsafe. Pouring contents carefully into the aliquot tube can still lead to spills and aerosols, especially in busy or high-risk settings. Therefore, promptly capping the tube is the correct action.