Question: In a Timed Text Format for Transparent end-to-end Packet switched Streaming Service (PSS), what does the three-letter code in the language field of the media-header box represent, and how is rendering handled in relation to this code?
Option 1: A two-digit country code, with rendering adapted based on the specified language.
Option 2: An ISO 639/T three-letter code for a human language, with rendering adapted based on the specified language.
Option 3: A unique identifier for font styles, with rendering always being language neutral.
Option 4: An ISO 639/T three-letter code for a human language, with rendering handled in a language-neutral manner.
Explanation: The correct answer is Option 4 because the language field indeed uses an ISO 639/T three-letter code to declare the human language used in the stream. Importantly, the specification notes that "Rendering is language neutral," indicating that while knowing the language can aid in searching or speaking the text, the actual rendering of the timed text format does not change based on the language declared by the three-letter code.