Explain step by step how to use a separatory funnel to extract caffeine from an aqueous mixture to the dichloromethane layer as per the pdf procedure.
A) Add the aqueous mixture to the separatory funnel, shake gently, allow layers to separate, and drain the bottom layer.
B) Add the dichloromethane layer to the separatory funnel, shake vigorously, allow layers to separate, and drain the bottom layer.
C) Add the aqueous mixture to the separatory funnel, shake vigorously, allow layers to separate, and drain the bottom layer.
D) Add the aqueous mixture to the separatory funnel, shake gently, allow layers to separate, and drain the top layer.