Which mode is used to allow only a single person to edit a configuration?（）

A. The ge-0/0/0 interface was added to the candidate configuration.
B. Area 0 was added to the active configuration.
C. Area 1 was added to the candidate configuration.
D. The ge-0/0/0 interface was added to the active configuration.

A. The candidate configuration is a temporary configuration that might become the active configuration.
B. A candidate configuration is initially populated with the configuration currently active on the system.
C. Changes to the candidate configuration take effect immediately.
D. The candidate configuration becomes the active configuration after a system reboot.
E. The configure private command allows concurrent editing of a candidate configuration by multiple users.

A. help topic
B. help reference
C. help apropos
D. help tip