Question: In an MBMS File Repair Response Message using HTTP carriage for Complete Files, what is the mandatory setting for the 'Content Type' in the HTTP header to encapsulate multiple files?
Option 1: application/octet-stream
Option 2: multipart/related
Option 3: text/plain; charset=UTF-8
Option 4: video/mp4
Explanation: The correct answer is `multipart/related` because, according to the MBMS specifications for File Repair Response Messages over HTTP, the Content Type must be set to `multipart/related` to properly encapsulate multiple complete files within a single response, utilizing a multipart mime container. This setting ensures that each part of the response can be identified and processed correctly by the client, including specifying the Content-Location of each embedded file.