You are a desktop support technician for your company. All client computers run Windows XP Professional. All users in the research department use both desktop and portable computers. Each computer in the research department has a four-port USB hub for I/O devices.

A user in the research department purchases and connects a portable USB hard disk to the USB hub
attached to his portable computer. However, the port on the USB hub shuts down and the hard disk does not function. The USB hard disk functions properly when it is attached to the USB hub connected to the user’s desktop computer. All other USB devices function properly when they are attached to the portable computer’s USB hub.

You need to ensure that the USB hard disk can function properly when connected to the USB hub on the user’s portable computer.

What should you do?

A.
Instruct the user to replace the USB hard disk’s USB cable with a shorter USB cable.

B.
Assign an IRQ to the USB hub in the computer’s system BIOS.

C.
Instruct the user to replace the portable computer’s bus-powered USB hub with a self-powered USB hub.

D.
Disable all USB power management features for the USB root hub.