An organization's security policy mandates that all web-based transactions be conducted in a manner that guarantees confidentiality, data integrity, and authentication. To comply with this policy and optimize the security of its online services, which protocol should be employed on the organization’s web servers to provide the BEST level of protection for client-server communications?
Mandate the use of Simple Mail Transfer Protocol Secure (SMTPS) for all web server communications.
Use Internet Message Access Protocol Secure (IMAPS) for web traffic integrity.
Implement File Transfer Protocol Secure (FTPS) across the organization's servers.
Enforce HTTPS on port 443 on the web servers.