Which of the Following Is True About Which Folders to Use

Which of the following is true about which folders to use to hold shared data when working with a workgroup?

A) private data for each user should be kept in their C : \ Users folder
B) all users have access to the folders in the C : \ Users folder
C) C : \ Users\Public should only be used by the Guest account
D) Only Administrators and Guest have access to C : \ Users\Public