Which header should be included first?

This question is about the order of including header files in MySQL. Header files provide definitions and declarations that are needed by the MySQL code.
Here's the breakdown:
Option A: my_global.h - This header file contains global definitions and configurations for MySQL. It needs to be included first as it defines crucial settings for the entire system.
Option B: my_sys.h - This header file handles system-related definitions, which are also important. It usually needs to be included after my_global.h.
Option C: mysql.h - This header file includes specific definitions related to the MySQL API (Application Programming Interface). It's included after both my_global.h and my_sys.h.
Option D: my_local.h - This header file contains local definitions, which are often specific to a particular module or component of MySQL. It's usually included after mysql.h.
Therefore, the correct answer is Option A: my_global.h