Final answer:
The command to refresh Group Policy settings on a host immediately is gpupdate /force, not gpedit.msc, net use, or ipconfig /flushdns.
Step-by-step explanation:
The command that refreshes Group Policy immediately on a host is gpupdate /force. This command will apply any new or changed Group Policy settings to the computer and logged-on user. The gpedit.msc command opens the Group Policy Editor, net use is used to connect, remove, and configure connections to shared resources, and ipconfig /flushdns clears the DNS resolver cache.