Question: In a Timed Text Format for Transparent end-to-end Packet switched Streaming Service (PSS), what does the 'dlay' box specify, and what is its default value if absent?
Option 1: A delay after a Scroll In and/or before Scroll Out, with a default delay of 0 units of the track's timescale.
Option 2: The speed of scrolling text, with a default speed that matches the track's frame rate.
Option 3: The font size for scrolled text, with a default font size of 12 points if not specified.
Option 4: The direction of text scroll (e.g., left to right, right to left), with a default direction set to left to right.
Explanation: In the context of Timed Text Format for PSS, the 'dlay' box introduces timing control for scrolling text elements, specifying a delay after Scroll In and/or before Scroll Out. The default value of 0 units means no additional delay is introduced if absent, ensuring seamless scrolling based on the track's timescale.