Question: What is a likely reason for operators to specify additional rules and restrictions when deploying terminals for Timed Text format in PSS, beyond what is outlined in the specification?
Option 1: To accommodate geographical variations in required character sets for effective user communication.
Option 2: To uniformly enforce a single global standard for all deployments regardless of location.
Option 3: Solely to manage network bandwidth and optimize data transmission speeds.
Option 4: Exclusively to ensure backward compatibility with legacy terminal devices.
Explanation: The correct answer, Option 1, highlights the importance of geographical considerations in determining character sets for effective communication. This aligns with the implication that different regions may require different character sets (e.g., languages, scripts), making this a plausible reason for operators to specify additional deployment rules. The other options do not directly relate to the nuanced adaptation needs based on geography as implied by the context of character set dependency on deployment geography.