Which statement is true regarding a spotting of "LINE" during an artillery observation?

The statement regarding a spotting of "LINE" during an artillery observation is accurate in its indication of the relationship between the round's impact and the observer-target line. When an observer reports "LINE," it signifies that the round has impacted directly along the line connecting the observer to the target. This means that the positioning of the round aligns perfectly with the intended target direction, either hitting the target or falling at the correct distance along that line.

This term is critical in artillery operations as it helps communicate precise information about the accuracy of fire and informs subsequent adjustments for additional rounds, if necessary. Understanding the meaning of "LINE" aids in quickly assessing the effectiveness of the artillery's impact relative to the target, thereby guiding future engagements and improving the efficiency of the artillery unit.