On Unix, 'mysql' client writes a record of executed statements to a history file.

Answer: Option A

This question is about how the MySQL client works on a Unix system.
The MySQL client is a program that lets you interact with a MySQL database.
On Unix systems, there's often a feature called a history file. This file keeps a record of the commands you've typed in the terminal.
The question asks if the MySQL client on Unix writes its commands to this history file.
The answer is True. The MySQL client on Unix does write a record of the statements you execute to the history file.
This is a common feature on Unix systems, so it's helpful to know that the MySQL client also uses it.
So the answer is Option A: True.