What is the default format for "Datetime" data type?

Answer: Option A

This question asks about the way MySQL stores dates and times using the "Datetime" data type. Let's break down the options:
Option A: YYYY-MM-DD HH:MI:SS This format represents the year (YYYY), month (MM), day (DD), hour (HH), minute (MI), and second (SS).
Option B: MM-YYYY-DD HH:MI:SS This format puts the month first, then the year, and so on.
Option C: DD-YYYY-MM MI:HH:SS This format places the day first, then the year, and so on.
Option D: None of the mentioned This option suggests that none of the above formats are the default.
The correct answer is Option A: YYYY-MM-DD HH:MI:SS. MySQL stores dates and times in the "YYYY-MM-DD HH:MI:SS" format by default.
Remember, understanding data types and their formats is crucial for working with databases efficiently.