Question: In a Timed Text Format for Transparent end-to-end Packet switched Streaming Service (PSS), what is the primary purpose of including a complete list of fonts used in the sample description?
Option 1: To ensure terminals use the exact font version as the authoring system to maintain layout consistency.
Option 2: To enable terminals to pre-load fonts or decide on font substitution, accommodating varying font versions across systems.
Option 3: To specify the minimum storage requirement for font storage in receiving terminals.
Option 4: To define a new standard font for all PSS streaming services.
Explanation: The correct answer highlights the practical application of including a font list: facilitating terminals to either pre-load necessary fonts or make informed decisions about substituting fonts when the exact version is not available, accommodating variability in font versions across systems and minimizing layout inconsistencies.