An organization is preparing to deploy a new server running a popular open-source operating system. To enhance the security of this server, which of the following would be the BEST resource to consult for hardening the system according to industry best practices?
General Data Protection Regulation (GDPR) documentation
A platform/vendor-specific guide for the operating system
National Institute of Standards and Technology (NIST) Cybersecurity Framework (CSF)
Company-wide Acceptable Use Policy (AUP)