After editing to your device's configuration, which command must you enter to activate the configuration changes?

The `set` command is used to add or modify configuration, not to activate it.

`copy candidate active` is not a valid Junos OS command for activating configuration.

`apply-config` is not a standard Junos OS command for activating configuration changes.

In Junos OS, configuration changes are made in a candidate configuration. To apply these changes to the active configuration and make them operational on the device, the `commit` command must be executed. This command performs a syntax check, saves the changes, and activates them.