Which of the following is a type of non-lethal round fired from the M500?

The bean bag round is specifically designed for non-lethal applications, making it suitable for situations where a less-than-lethal response is required. It is effective in subduing a subject without causing severe injury, which is essential in law enforcement and crowd control scenarios. The design of the bean bag round allows it to provide a blunt impact that can incapacitate a target while minimizing the risk of permanent harm.

In contrast, other types of rounds mentioned, such as plastic rounds, rubber pellets, and smoke rounds, may have different uses or levels of lethality. Plastic rounds can be used in training settings and may not have the same incapacitating effect as bean bag rounds. Rubber pellets can also cause injury and are not classified as non-lethal in the same manner as bean bags. Smoke rounds are primarily for signaling or creating cover and do not directly incapacitate a subject. Thus, the bean bag round stands out as the appropriate choice for a type of non-lethal round.