Which classification levels of data can Jim access with his Secret clearance under mandatory access control?

With a Secret clearance under mandatory access control, Jim is authorized to access information classified at the Secret, Confidential, and UNCLAS (Unclassified) levels. Mandatory access control (MAC) systems are designed to maintain strict levels of security and ensure that users can access data according to their clearance level.

A Secret clearance allows access to any data classified as Secret, which is a higher classification level. Additionally, users with a Secret clearance are also allowed to access data classified at lower levels, such as Confidential and Unclassified. This hierarchical structure of classification levels ensures that users can perform their duties while safeguarding sensitive information appropriately.

Thus, the answer includes all three levels of classification that Jim can access, demonstrating the broad scope of access granted by a Secret clearance in a MAC environment.