Question: In a Timed Text Format for Transparent end-to-end Packet switched Streaming Service (PSS), what is the primary purpose of dynamic highlighting in the context of Closed Caption and Karaoke?
Option 1: To provide interactive text editing capabilities to the user.
Option 2: To highlight successive contiguous sub-strings of the text sample at specified times for enhanced viewer experience.
Option 3: To adjust the font size of the text based on the user's preferences.
Option 4: To translate the text into different languages in real-time.
Explanation: Dynamic highlighting for Closed Caption and Karaoke in a PSS Timed Text Format is utilized to emphasize parts of the text at specific times, enhancing the viewer's experience by drawing attention to successive portions of the text as it is displayed, which is particularly useful in scenarios where audio and video are synchronized with the text, such as in karaoke or closed captions.