Which type of round utilizes a high explosive rocket assisted design?

The M549 round is specifically designed with a high explosive rocket assisted design, which significantly enhances its range and performance on the battlefield. This type of round features a rocket propulsion system that ignites after the projectile has exited the barrel, providing an additional boost that extends its distance compared to standard artillery shells. The M549 is geared towards providing effective firepower against a variety of targets while ensuring that it maintains the necessary accuracy and lethality expected from modern artillery systems.

In contrast, the M982 is an extended-range, precision-guided munition but does not rely on a rocket-assisted design. The M825 is a special purpose round, typically used for producing smoke and illumination, rather than high explosive effects. The M110 is an older artillery round that does not employ rocket assistance either, as its design predates the advancements seen in rounds like the M549. Thus, the M549 is the correct answer as it clearly aligns with the specifications of having a high explosive rocket assisted design.