A security officer is requiring all personnel working on a special project to obtain a...

Labeling files and requiring formal access authorization is a method that aligns with the principle of least privilege and the need-to-know basis. By assigning labels to files based on their sensitivity and requiring formal access approval from the data owner, the security officer can ensure that only personnel with the necessary clearance and a legitimate need to access the information can do so. This approach helps in maintaining data confidentiality and integrity in line with the project's security requirements.