Which command returns a list of commands in which a given keyword is used throughout the Junos hierarchies?（）

A. shutdown
B. deactivate
C. disable
D. down
E. delete

A. user@router> show configuration
B. user@router# show
C. user@router> show system configuration
D. user@router> show system commit

A. It allows users to retain all uncommitted changes when exiting exclusive configuration mode.
B. It allows multiple users to edit private copies of the configuration concurrently.
C. It causes the loss of all uncommitted changes when exiting exclusive configuration mode.
D. It excludes other users from editing the configuration.