Please choose the correct solution to the question: how to thicken a milkshake

Solution1: once everything is blended, stick the blender top (not the motor) into the oven for 1-2 hours and then re-blend.

Solution2: once everything is blended, stick the blender top (not the motor) into the freezer for 1-2 hours and then re-blend.

Answer format: solution1/solution2