Final answer:
After decommissioning the organization's last Windows XP system, the next step is retiring the Windows XP standard from the organization's security protocol. Chris should also continue to review and improve the Windows security standards to combat current and emerging threats.
Step-by-step explanation:
Now that Chris has decommissioned the organization's last Windows XP system, the next step in the security standard life cycle would be D. Retiring the Windows XP standard. After completing this step, the security standard no longer needs to include references to Windows XP, since it is no longer in use within the organization. This removal simplifies the standard and ensures that security practices are current.
However, it's vital for Chris to engage in a continual improvement of the organization's Windows security standards. This involves regularly reviewing, updating, and refining security protocols to adapt to new threats and incorporate improvements for other versions of Windows in use.
The scheduled review of the Windows standards is also an essential ongoing process, which ensures that all security protocols are up to date and effective against current cybersecurity threats. Although Windows XP has been retired, the overall Windows security standards should consistently reflect the latest best practices and threats.