Which of the following is true for parallel screw plug gauges?

• A. The minor diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
• B. The flank angle is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
• C. The effective diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
• D. Pitch is measured by making a measurement on a diameter measuring machine between the flat ends of Vees