In right handed coordinate system which axis is considered to be positive?

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