Question: In the diagram below, the ID fields are declared as type CHAR instead of INT . Which is NOT one of the possible reasons behind that decision?

1. The ID field needs to include letters and not just numbers.
2. You can have a consistent format across all of the tables that require ID fields.
3. The ID field needs to have leading 0s, which the INT data type would truncate.
4. The `CHAR(10)` data type is more efficient and space-saving.

Answer: The correct answer of the above question is Option D:The `CHAR(10)` data type is more efficient and space-saving.