Which command will list current versions of FortiGuard databases installed on the device?

The command that lists the current versions of FortiGuard databases installed on the device is "diagnose autoupdate versions." This command is specifically designed to retrieve details about the various FortiGuard updates for both antivirus and intrusion prevention systems, including their current versions. By running this command, administrators can assess whether the device has the latest updates installed or if any updates need to be applied, ensuring that the firewall maintains optimal security posture against emerging threats.

In contrast, the other options do not provide the same specific information regarding FortiGuard database versions. For instance, "get current fortiguard status" provides a general overview of the FortiGuard services and their operational status but does not detail database versions. Similarly, "show versions" and "list fortiguard databases" lack the specificity needed to highlight the current database versions installed on the device. These commands may offer other useful information but do not fulfill the requirement of listing the specific versions of FortiGuard databases.