单选题A user reports that a newly installed external CD-RW is not working. Jill, a technician, is called and notes the user has the CD-RW drive, a flash disk, a rarely used external hard drive and a wireless network adapter plugged into an external USB hub. Which of the following is the MOST likely reason for the problem?（）AThe USB hub needs more USB ports.BThe USB hub is a version 1.1.CThe USB hub was not externally powered.DThe USB hub is a version 2.0.
单选题
A user reports that a newly installed external CD-RW is not working. Jill, a technician, is called and notes the user has the CD-RW drive, a flash disk, a rarely used external hard drive and a wireless network adapter plugged into an external USB hub. Which of the following is the MOST likely reason for the problem?（）
A
The USB hub needs more USB ports.
B
The USB hub is a version 1.1.
C
The USB hub was not externally powered.
D
The USB hub is a version 2.0.
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