Which statements below are correct? represents the local shearing strain or change of angle and is unitless L represents the axial distance from the point of interest to the reference end of the shaft and has the unit of m represents the distance from the point of interest to the cylindrical shaft axis and has the unit of m represents the angle of twist for the plane of interest with respect to the reference end of the shaft. The above geometric relationship holds true when the angle of twist is as large as 360o (or 2 )