An A+ Certified Technician MUST do an install on a Windows XP system from the distribution CD. However， the system does not boot from this CD. What is the MOST likely cause of this problem？（）

1. A The CD is defective.
2. B The CD is not bootable.
3. C The CD-ROM drive is defective.
4. D The Boot Sequence is not set in the BIOS to boot first from the CD 正确答案