I think: B,C,D. You do not need to write notes on a thing that you will only see, but you need a date, key words, and main ideas.
There are many advantages!
1. you can see data or information visually
2. for most cases, it is easier to have the information visually displayed than with flashing LED lights or sound
3. with a screen, developers are able to build intuitive user interfaces and it is easier for us to use out computer with a display
4. when a developer has to code an application or something, it is better if the developer visually sees his code than hearing the the dedicated sounds of the keys or something
I can go on and on but I guess this is enough for now
How about you prefer no class
From Google:
"User Account Control<span> or </span>UAC<span> for short is a security feature of Windows which helps prevent unauthorized changes to the operating system. These changes can be initiated by applications, users, viruses or other forms of malware."</span>
The answer to your question would be service writer. The service writer's job, is to log all information and such, and generally decide what happens.