Your question asks what the word "command" is.
The reason why answer choice "D). Directing, ordering, or controlling by virtue of explicit statutory, regulatory, or delegated authority" would be the correct answer is because this is the right definition for command. Command is the ability of someone to order someone to do something. Command is something that people who have authority could do. For example, a boss in a office could command someone to print out the files for the next meeting, and the person would do it. Command is a very powerful thing someone with authority could do, and it could be abused by people who are in charge. You can see command in a work place, school, etc.
