A third-party vendor is moving a particular application to the end-of-life stage at the end of the current year. Which of the following is the most critical risk if the company chooses to continue running the application?

The most critical risk when continuing to run an end-of-life (EOL) application is the lack of security updates. EOL means the vendor will no longer patch vulnerabilities, leaving the application susceptible to new exploits and increasing the risk of breaches. While a lack of new features might hinder productivity, it doesn't pose an immediate security threat. A lack of support can make troubleshooting difficult, but again, it's not as critical as unpatched security flaws. Lack of source code access is generally not an issue for most commercial software users and doesn't directly impact the security posture of an EOL application in the same way as missing patches.