Answer:
If you are looking for a different type of GUI operating system then :
Linux or mac
if you are looking for a different type of operating system (non-GUI):
Command-line interface
Explanation:
<span>The Huns were a formidable force to fight. They were able to eat most food without problem which removes the needs for supply trains and such and encourages pillaging. Another reason is that their a cavalry based army which completely decimated roman military since the roman empire consist of flat land and they could outflank, outrun, and could whittle down an army with ease. They also are nomads which means you don't know where they're living and so you can't be on the attack which also gave an advantage. This points that the Huns are a force to be reckon with.</span>
In theory, you can of course use any language you like, but there are a few commonly used ones.
From your list it would be c++ or c#, because if you actually have the interest long term then those will be the languages used by the various "big"/well known/used engines.
I would suggest c#, because it can be used with the Unity engine, which has an enormous community with help resources especially to start out and learn to program or game development.
On the other hand I would also suggest JavaScript. It isn't used for any of the big title development, but for all the *.io games like slither and so on. When looking at such games you will quickly notice that they are generally much simpler (for example 2D not 3D), because game engines are just simpler in JavaScript. While this is obviously limiting it might help to get something simple actually working, instead of getting stuck in extra complexities and additional features until you lose your motivation.
The basic programming you learn is still the same, so after you have learned a language you can quickly pick up most others.
<span />
Answer:
Depends. could be an external opticial drive, a scuzi drive, a real to real tape system, or just a simple electromagnetic hard drive with speeds of 1000 rpm or more