Which option represents a key characteristic of segment-based security groups?

Segment-based security groups are designed to control access to specific data segments within an organization. This means that these groups are crucial for ensuring that users have the right level of access to the information they require for their roles while maintaining the security of other data segments that they do not need to access. By limiting access to only the relevant segments of data, segment-based security groups help in adhering to data privacy regulations and organizational policies.

The other options do not accurately describe the defining characteristics of segment-based security groups. For example, overlapping memberships are often permissible and can even enhance flexibility in access control. The assertion that they must contain all users in the organization contradicts the very purpose of segment-based security, which is to restrict access based on specific roles or needs. Finally, stating that they are temporary and often expire is misleading, as segment-based security groups are typically established to provide ongoing access controls rather than being designed for temporary use.