Windows XP Professional can accommodate the addition and removal of many types of devices. The installation of a device results in the installation of drivers and allocation of resources. Subsequent removal of the device can result in this information disappearing from Device Manager. How would this information be retrieved?

a. Run Device Manager, choose View, Show Hidden Devices. The devices in question will now appear in Device Manager.
b. At the command line, type set devmgr_show_nonpresent_devices=1 and press enter. A listing of the devices in question, the driver and driver version, and resources assigned will appear in the command window. Pressing CTRL-P will print this information to an attached printer.
c. The information cannot be retrieved once the device has been physically removed.
d. At the command line, type set devmgr_show_nonpresent_devices=1 and press enter. Open Device Manager. The devices in question will now be displayed.
e. Run Hardware Troubleshooter, choose View, Show Non-Installed Device Allocations.

The correct answer is d. At the command line, type set devmgr_show_nonpresent_devices=1 and press enter. Open Device Manager. The devices in question will now be displayed.

To retrieve the information of a device that has been removed from Device Manager in Windows XP Professional, you can use the following steps:

1. Open the command prompt: Press the Windows key + R to open the Run dialog box, then type "cmd" and press Enter.

2. In the command prompt window, type "set devmgr_show_nonpresent_devices=1" and press Enter. This command enables the display of hidden devices in Device Manager.

3. Still in the command prompt window, type "start devmgmt.msc" and press Enter. This will open Device Manager.

4. In Device Manager, go to the View menu and choose "Show Hidden Devices". This will make the devices in question, which were previously removed, appear in Device Manager.

Now, you will be able to see the devices that were previously installed, along with their drivers and assigned resources, even though they are no longer physically connected to the computer.

It is important to note that this method will only display information about previously installed devices. If a device has been physically removed and all associated drivers and information are no longer present in the system, it will not be possible to retrieve the information.