Question: For PSS clients supporting timed text as per specifications, what is the implication for handling 3GP files containing multiple media types (e.g., timed text, AMR audio, H.264 video)?
Option 1: PSS clients must render all media types (timed text, audio, video) contained in a single 3GP file.
Option 2: PSS clients only need to parse and render the timed text from 3GP files; other media types are streamed separately using SP/P.
Option 3: Support for timed text in PSS clients excludes the use of 3GP files for any audio or video content.
Option 4: All PSS clients must download the entire 3GP file but only render the media types specified in their client profile.
Explanation: This is correct because a PSS client supporting timed text needs to receive and parse 3GP files containing text streams. However, it does not require rendering other continuous media types if present in the same file. Instead, these are streamed separately using SP/P, indicating a distinction in handling based on media type.