Explain the concept of Label-Based Access Control (LBAC) in DB2 and its significance in security.

Label-Based Access Control (LBAC) in DB2 is a security feature that assigns security labels to both data and users within the database. These labels are used to enforce access controls, allowing administrators to define policies that restrict access to sensitive data based on these labels. For example, certain data may be labeled as "confidential" or "restricted," and users may be assigned corresponding security labels based on their roles or clearance levels. LBAC ensures that only users with the appropriate security clearance can access sensitive data, thereby enhancing the overall security of the database environment.