The slow query log is written as . . . . . . . .

This question asks about the format of the slow query log in MySQL.
The slow query log records information about queries that take longer than a specified time to execute.
Let's look at the options:
Option A: numbers - While the log contains numbers, it's not just numbers.
Option B: text - This is the correct answer! The slow query log is written as text. It includes details like the query itself, the time it took to execute, and other relevant information.
Option C: image - The slow query log doesn't store information as images.
Option D: graph - While you can analyze the log data to create graphs, the log itself is not stored in graph format.
Therefore, the correct answer is Option B: text.