Final answer:
To prevent a moire pattern in a CR digital image, it is best to have the grid lines running perpendicular to the direction of the laser beam.
Step-by-step explanation:
In order to prevent a moire pattern in a CR digital image, it is best to have the grid lines running perpendicular to the direction of the laser beam. When two patterns or grids are superimposed, a moire pattern can appear due to interference. By having the grid lines perpendicular to the laser beam, it reduces the chances of overlapping patterns and reduces the likelihood of a moire pattern.