To answer this question, you need to understand the behavior of the SQL ORDER BY clause.
The ORDER BY clause is used to sort the result set of a SQL query. By default, if you don't specify ASC (ascending) or DESC (descending) after the ORDER BY clause, the following is used by default:
Option A) There is no default value - This option is incorrect. By default, when you don't specify ASC or DESC, there is a default sort order.
Option B) DESC - This option is incorrect. DESC is not the default sort order.
Option C) Random - This option is incorrect. There is no random default sort order.
Option D) ASC - This option is correct. When you don't specify ASC or DESC, the default sort order is ascending (ASC).
Therefore, the correct answer is option D.