Question: In HTTP streaming for 3GPP file format (3GP), what is the primary purpose of starting 'segment files' with a segment-type box (styp) when stored separately?
Option 1: To ensure backward compatibility with non-3GPP devices
Option 2: To enable encryption for secure content delivery
Option 3: To facilitate faster download speeds through parallel processing
Option 4: To enable identification of the file and declaration of its specification compliance
Explanation: Starting 'segment files' with a segment-type box (styp) allows for the immediate identification of the file's specifications and compliance, such as with the 3GP Media Segment Profile. This is crucial for ensuring that segments can still be recognized and handled appropriately by devices or servers, especially in scenarios where these segments are stored or transmitted independently.