In which configurations can the M240 be utilized?

The M240 can be utilized in multiple configurations, specifically handheld, vehicle-mounted, and aircraft-mounted, which makes it a versatile machine gun suitable for various combat scenarios. This flexibility allows the gunner to adapt the weapon's deployment based on the tactical needs of the mission.

When handheld, the M240 can be operated by infantry soldiers, providing them with a reliable and powerful weapon during ground operations. As a vehicle-mounted option, it can be affixed to military vehicles, enhancing firepower while allowing for mobility and protection for the crew. Additionally, when aircraft-mounted, it can be utilized by helicopters and other aircraft, providing air support and suppressive fire from above.

This adaptability is a critical aspect of the M240's design and operational effectiveness, enabling military units to engage targets effectively across a range of environments and situations. Hence, the correct answer reflects the full range of configurations in which the M240 can be deployed.