What is one way a shotgun can be utilized in addition to firing pellets?

A shotgun can be utilized in a variety of ways beyond simply firing pellets. In this context, it is important to understand that shotguns can be equipped with specialized ammunition and attachments that enable them to serve different purposes, one of which is functioning as a device for launching grenades. This capability is made possible with specific types of ammunition designed for such use, often referred to as "less-lethal" or "specialty" rounds.

When a shotgun is modified or designed to launch grenades, it provides law enforcement with a non-lethal option that can be effective in certain tactical situations where firing conventional rounds may not be appropriate. This versatility allows for a broader range of applications in the field, including the ability to deploy gas canisters or other crowd control munitions.

The other options, while they may also have merit in different contexts, do not represent the primary alternative functionality of a shotgun in a tactical scenario like firing grenades does. For example, while a shotgun can theoretically be used for rescue or training purposes, these applications do not capitalize on the inherent design and modifications specific to utilizing the weapon for grenade launching.