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A junior administrator updated the PostgreSQL service unit file per the data-base administrator's recommendation. The service has been restarted, but changes have not been applied. Which of the following should the administrator run for the changes to take effect?
Correct Answer: B
To apply changes to a systemd service unit file, the administrator needs to reload the systemd daemon using the command systemct1 daemon-reload (B). This will make systemd aware of the new or changed unit files. The other commands will not reload the systemd daemon or apply the changes. Reference: [CompTIA Linux+ Study Guide], Chapter 7: Managing System Services, Section: Modifying Systemd Services [How to Reload Systemd Services]