Which method ensures that the mortar is directly aimed at the target?

Direct Lay is the method that ensures the mortar is directly aimed at the target. In direct lay, the mortar crew has a clear line of sight to the target, allowing them to adjust their aim based on visual feedback. This method is typically employed when the target is within the range of the mortar and can be accurately observed, enhancing precision. By using direct lay, the crew can make immediate corrections for firing based on what they see, which is crucial for engaging moving or rapidly changing targets.

The other methods, while valid in their respective contexts, do not involve the same direct line of sight and visual adjustments. For example, indirect fire relies on predetermined data and calculations rather than direct observation, thus potentially leading to greater errors if those calculations are not precisely made.