Explanation
A: The Sessions window lists active user sessions and requests for the server, application, or database. A user can have more than one session open at any given time. For example, one user may have open sessions on two databases.
If you have Administrator or Application Manager permissions, you can end all requests, end all requests for a user, or end a specific request.
C: To restructure a database:
References:
Oracle Cloud Designing with Calculation Manager for Oracle Enterprise Performance Management Cloud, page 12-21
https://docs.oracle.com/cloud/latest/epm-common/ECALC/ECALC.pdf