单项选择题
After POST, the error message ‘Invalid system disk. Replace and press any key’ appears. Which of the following is MOST likely the cause?（）
A. There is a non-bootable CD in the CD-ROM drive.
B. There is a non-bootable DVD in the DVD-ROM drive.
C. There is a non-bootable Blu-Ray in the Blu-Ray drive.
D. There is a non-bootable floppy in the floppy drive.
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