When multiple users are editing the configuration on a Junos device, what is the default behavior when a user issues a commit command?

A. All valid configuration changes made by all users will take effect.

B. The user’s configuration changes are committed; other users’ configuration changes are still pending.
C. The user will receive an error message disallowing a commit of the configuration.
D. The user’s configuration changes are committed; other users will be exited from configuration mode.