Which command can you enter to verify that a router is synced with a configures time source?

`show ntp authenticate` displays NTP authentication status, not synchronization status.

`ntp associations` is not a valid command to display NTP association status; it's likely a partial or incorrect command.

`ntp server time` is not a standard command for checking NTP synchronization status.

`ntp authenticate` is a configuration command used to enable NTP authentication, not a show command to verify synchronization.

The `show ntp associations` command provides detailed information about the NTP peers and servers with which the router is attempting to synchronize, including their reachability, stratum, and whether synchronization has been achieved. The asterisk (*) next to a peer/server indicates successful synchronization.