From which configuration can the M249 automatic weapon be emptied?

The correct choice is that the M249 automatic weapon can be emptied from all configurations available, which includes manual feed, magazine feed, and belt feed.

The M249 is designed to be versatile in how it can be loaded and operated. The manual feed allows for single rounds to be fed manually into the chamber, which can be useful in specific tactical situations. The magazine feed permits the use of detachable magazines, making reloading quicker and accommodating various tactical needs. Lastly, the belt feed option enables continuous fire with linked ammunition, suitable for sustained fire scenarios.

This adaptability allows operators to choose the most effective feeding method based on the operational environment and specific tactical requirements, thereby maximizing the weapon's functionality and effectiveness in various combat scenarios.