To know the rotations involved in the journal bearings we use right handed coordinate system, in that system which of the following is followed (consider the mentioned axis to be positive)?

• A. Thumb is z-axis, fingers curled from x-axis to y-axis
• B. Thumb is x-axis, fingers curled from z-axis to y-axis
• C. Thumb is y-axis, fingers curled from x-axis to z-axis
• D. Thumb is z-axis, fingers curled from y-axis to x-axis