6. Select a plus of positional tolerance being based on a minimally constrained adjustment. (a) The standard of unit weight does not need to be used as a multiplier. (b) The error ellipses will be based on how your data fits itself and not how it fits external control. (c) The size of error ellipses will be independent of their distance from the nearest control point. (d) The error ellipses are independent of the error estimate model