Enforcing technical security standards is the most effective way to ensure that a new server is appropriately secured because it ensures that the server complies with the organization’s security policies and best practices, such as encryption, authentication, patching, and hardening. Performing secure code reviews is not relevant for securing a new server, unless it is running custom applications that need to be verified for security flaws. Conducting penetration testing is not sufficient for securing a new server, because it only identifies vulnerabilities that can be exploited by attackers, but does not fix them. Initiating security scanning is not sufficient for securing a new server, because it only detects known vulnerabilities or misconfigurations, but does not enforce security standards or remediate issues. References: https://www.isaca.org/resources/isaca-journal/issues/2016/volume-4/technical-security-standards-for-information-systems https://www.isaca.org/resources/isaca-journal/issues/2017/volume-3/secure-code-review https://www.isaca.org/resources/isaca-journal/issues/2017/volume-2/the-value-of-penetration-testing https://www.isaca.org/resources/isaca-journal/issues/2016/volume-5/security-scanning-versus-penetration-testing