A. File Explorer, Documents, Downloads, Music, Pictures, Videos
B. All of A) and HomeGroup, Network, and your Usersusername folder
C. All of a above and C:, OneDrive, and This PC
D. All of a above and Windows, Users, and Program Files.
There are 10 built-in icons (including Settings, that can be incited off), and dual that are compulsory – Power and your User profile.