Which file is the batch file that is read while booting a computer?

During the boot process of a computer running Disk Operating System (DOS), the batch file that is read is typically named Autoexec.bat. This file is automatically executed by DOS during startup and can contain commands that configure system settings, load device drivers, and set environment variables.

Option B, "Auto-batch," and Option C, "Autoexecutive.bat," are not standard filenames used during the DOS boot process.

Option D, "Auto.bat," while close in name to the correct option, is not the standard filename traditionally used for the batch file executed during boot-up.

Therefore, the correct answer is Option A: Autoexec.bat.