What action ensures that users are not able to run unapproved applications?

Blocking all unhandled applications is an effective method to ensure that users cannot run unapproved applications. This approach creates a security layer by preventing any application that has not been explicitly permitted from executing on the system. When the system is configured to block unhandled applications, it essentially creates a deny-all policy by default. This means that only those applications that have been vetted and approved by the organization's IT or security teams are allowed to run, which significantly reduces the risk of malicious software being executed and exploited by users.

This strategy is essential for maintaining a secure computing environment, especially in situations where users may inadvertently or intentionally attempt to run software that could compromise system integrity or data security. By establishing strict controls around application execution, organizations can better manage their security risks associated with endpoint devices.

In contrast, other options do not provide the same level of control over application usage. Allowing all applications would expose the organization to significant risk, as it permits any software to be executed, regardless of its safety or purpose. Similarly, prompting for approval may not be effective in all situations, as users could either ignore or bypass the prompt. Monitoring usage alone does not prevent unapproved applications from being run; it merely provides oversight after the fact, leaving potential vulnerabilities unaddressed.