What type of clearance allows case-by-case access to sensitive project materials?

The correct answer, which is the clearance level of "Confidential," is significant because it indicates that access to sensitive project materials is granted on a need-to-know basis. This type of clearance ensures that only individuals who require access to specific sensitive information to perform their job functions are authorized to view or handle that information.

This approach helps to safeguard sensitive project materials against unauthorized access, while still allowing necessary personnel to perform their roles effectively within the project. The notion of case-by-case access aligns well with the principles of the "Confidential" clearance, as it is intended to protect information that, if disclosed without authorization, could have serious implications for the organization or project.

Other clearance types are more generalized. For instance, "Restricted" may imply a broader range or a lower threshold of handling sensitivity, whereas "Public" does not restrict access at all and is intended for information that is openly available. "Internal" typically refers to information meant for internal company use, but it does not specify the same level of sensitivity or restricted access that "Confidential" entails. Therefore, "Confidential" is the most appropriate choice when discussing selective access based on the sensitivity of project materials.