During a cybersecurity audit at ABC eccouncil video

Full Certification Question

During a cybersecurity audit at ABC Corporation, the IT team discovers that multiple workstations have an open TCP port 445 exposed to the internet. A security researcher warns that this could allow attackers to exploit vulnerabilities like EternalBlue, which was used in the infamous WannaCry ransomware attack. Which protocol primarily operates on port 445, making it a critical security risk?