Final answer:
A committee investigating health care reform impacts within an organization is a formal group, officially structured with specific objectives to perform tasks aligned with the organization's goals, unlike virtual teams, informal groups, or peer-to-peer networks.
Step-by-step explanation:
A committee that is investigating the impacts of health care reform on the organization is an example of a formal group. Formal groups are typically structured with a specific objective in mind and are created within an organization to perform tasks that are aligned with the organization's objectives. Such a committee is officially delegated to perform functions such as investigating, considering, reporting, or acting on a matter. This differs from informal groups, virtual teams, and peer-to-peer networks, which have different characteristics and purposes within an organization.
In reference to the choices provided: Virtual teams are composed of geographically dispersed members connected through digital communications; an informal group comes together spontaneously and is not formally structured within the organizational hierarchy; peer-to-peer networks refer to a technological framework for sharing resources amongst computers rather than an organizational team structure. The context provided regarding the committee indicates it is organized and has a formal mandate, which makes it a formal group.