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For medium volume, where does the roller sit?

  1. On base

  2. Halfway on its base and halfway behind the base

  3. Completely off the base

  4. Inside the base

The correct answer is: Halfway on its base and halfway behind the base

This is because the roller needs to be balanced in order to work properly. Placing it completely off the base or inside the base would make it unstable and unable to roll smoothly. Placing it on the base would make it slightly unbalanced and may cause it to roll in an inclined angle. Placing it halfway on the base and halfway behind the base provides the perfect balance and allows the roller to smoothly roll in a straight line.