A security administrator needs to reduce the attack surface in the company's data centers. Which of the following should the security administrator do to complete this task?

Upgrading end-of-support operating systems directly reduces the attack surface because these systems no longer receive security patches, leaving known vulnerabilities unaddressed and exploitable. By upgrading, the administrator eliminates these easy targets. Implementing a honeynet is a detection and deception mechanism, not a direct attack surface reduction. Defining Group Policy on servers is a security hardening measure, but it doesn't address the fundamental risk of unpatched, end-of-life software. Configuring servers for high availability improves uptime and resilience but does not inherently reduce the number of vulnerabilities an attacker can exploit.