China DOS Union

Under DOS, if you type more than 15 characters on the command line before the DOS prompt appears, what will happen?
A. The extra characters typed will be temporarily stored in the keyboard hardware's built-in buffer, and it will beep as a reminder
B. The extra characters typed will be lost, and it will beep as a notification
C. DOS will automatically expand the keyboard buffer length in the DOS data area to store the extra characters typed, and it will beep as a warning
D. DOS will send the first 15 characters typed to the user data area to free up space for the extra characters typed, and it will beep as a notification