An employee is attempting to access company resources kept on a centralized server. The user has the right permissions but cannot seem to access the share via the network. As the IT technician, you confirm that the workstation is on the same network as the server and that both devices are operational. Which of the following protocols is MOST likely used for sharing files over a network between Windows-based systems, and its corresponding port should be checked for proper configuration on both the client's firewall and the server's firewall?
RDP - 3389
CIFS - 445
FTP - 20/21
HTTPS - 443
SMTP - 25
HTTP - 80