A system administrator has been notified that an audit has found certain files containing proprietary source code to be accessible by all employees through a shared network drive. The source code should only be accessible to members of the development team. To align with best practices for permissions management, which of the following actions should the system administrator implement FIRST to remediate this issue?
Initiate a company-wide training on the importance of data confidentiality
Modify the permissions on the files to restrict access solely to the development team
Disable the shared network drive until a full user account review can be performed
Set up an alert system to monitor file access patterns and flag any unauthorized attempts