A=Application software
C=Microcomputer
D=hybrid computers
E=digital computer
F=Handheld computer
G=Dextop computer
Sorry,i couldn't help you in B.
They may require things such as plastic cut outs and glass depending if you want to be able to have a window to look into the pc. Some cases are 3D Printed although they have to be joined by screws at the end due to the fact that one whole print can take over a week and then it has to be well doesn't but looks better when sanded.
Answer:
THE OPERATING SYSTEM (OS)
Explanation:
Make sure you but no copyright, author, and date of publication, that may help.
No!The internet began in the 1950s when the US government was trying to use connected computers to compete with the Soviet Union's Sputnik. Hope this helps :)