Final answer:
Option B) DDD is the format element used to display the three-letter abbreviation 'Wed' for Wednesday.
Step-by-step explanation:
To display the three-letter abbreviation for Wednesday, you should use the format element represented by option B) DDD. In many programming languages and systems that handle dates, DDD is the placeholder that gets replaced with the three-letter name of the day of the week, such as 'Wed' for Wednesday. This is often used in date formatting functions or commands within various software platforms.