Define "Mail-enabled security group".

A mail-enabled security group is specifically designed to both manage permissions and facilitate email communication within an organization that uses Microsoft Exchange. This type of group not only controls access to resources but also allows for collective communication by being assigned an email address. Members of the group can receive emails sent to this address, allowing seamless collaboration and information sharing among multiple users.

This functionality distinguishes mail-enabled security groups from regular security groups, which do not have an email address associated with them. While the other options may describe various types of groups or functionalities, they do not capture the dual capability of mail-enabled security groups to both secure resources and support email communication. For example, a local security group manages permissions locally without providing an email interface, and a group that provides access to shared files specifically focuses on file access without any email capabilities. The concept of a special group with no email capabilities directly contradicts the purpose of having a mail-enabled security group.