Answer:
C. At least annually
Step-by-step explanation:
PCI DSS means Payment Card Industry Data Security Standard.
PCI DSS application requires a rescan annually and also requires a rescan after changes has been made in the application. Rescanning is important to ensure that changes made don't introduce new vulnerabilities into the system.
For Badin industries, since after running a vulnerability scan found no unsatisfactory findings, it is required for them to scan at least annually except the make changes to the PCI DSS application.