Explanation/Reference:
A:
* Will the maximum file size limit change in SharePoint Server 2013?
No, the maximum file size that can be uploaded to SharePoint will remain at 2GB.
* The maximum file size limit for storing file content through SharePoint is 2 GB regardlessof whether or not you are using RBS.
D: In SharePoint 2013, a binary large object (BLOB) is a file, such as a Office 2013 document or a video file. By default, these BLOBs, also named unstructured data, are stored online in the SharePoint content database together with the metadata, or structured data. Because BLOBs can be very large, it can be helpful to move BLOB data out of the SQL Server database, and onto commodity or content addressable storage. To do this, you can use RBS (Remote BLOB Storage).
Note:
* From Scenario (not C): Individual training videos must be in single files
* RBS stands for Remote Blob Storage. The premise of RBS is that it is much faster to render large BLOBs ( Binary Large Objects) from a file system rather than from a database (such as the SharePoint Content Database). Therefore, by moving this content out of the SharePoint Content Database, you not only shrink the overall size of your content database, you are able to also move that content on external file stores such as SAN, NAS or DAS.
Reference:https://technet.microsoft.com/en-us/library/ff628583.aspx