What type of fire allows mortars to hit elevated targets?

High angle fire is the correct type for allowing mortars to effectively engage elevated targets. This approach is characterized by launching projectiles at steep trajectories, which enables them to reach targets that are situated at a higher elevation than the firing position.

The steep angle of ascent and descent means that the rounds can clear obstacles or terrain features that might obstruct a flatter trajectory. This is particularly useful for engaging enemies who may be positioned on hills or in elevated fortifications. Mortars are designed for this high angle of fire, specifically to ensure that they can accurately impact targets that are not directly within the line of sight, but higher up.