Question: In a 3GPP-compliant terminal supporting Unicode 3.0 for Timed Text format, how does the overall writing direction setting impact the rendering of a mixed-case Unicode string like 'ABCdefGHI'?
Option 1: It only affects the layout of punctuation marks.
Option 2: It reverses the order of all characters regardless of case.
Option 3: It influences the character order based on the language's inherent writing direction, potentially altering the display sequence (e.g., 'ABCfedGHI' for left-right).
Option 4: It has no effect on the rendering of mixed-case strings.
Explanation: The overall writing direction setting in a terminal impacts how characters are laid out, especially in mixed-direction texts. For languages with a left-right writing system (like English), upper and lower case letters would be rendered in the input order, but for languages with a right-left system (like Hebrew), the order might appear reversed or adjusted according to the language's composition rules, as illustrated by the example 'ABCfedGHI' for a left-right setting. This demonstrates how the overall writing direction influences the display sequence of characters based on the selected language's inherent writing direction.