One of the Lehmann's rules of plane tabling, is

• A. location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances
• B. when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray
• C. when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays
• D. none of these.