<human>: Goal: How to mix a carton of juice before serving it

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- Take the carton in one or two hands, and keep it closed. Shake it firmly to make the contents mix together.
- Take the carton in one or two hands, and open it. Shake it firmly to make the contents mix together.
<bot>: Take the carton in one or two hands, and keep it closed. Shake it firmly to make the contents mix together.