CompTIA Server+

Answer - D - Hot Plug PCI allows for the removal and insertion of PCI devices without powering down the computer.

Key Takeaway: Hot Plug PCI allows you to remove and insert PCI devices without powering OFF the system. While using Hot Plug PCI, the individual PCI slots can be powered ON and OFF without affecting the functioning of the system. This gives a great deal of flexibility in removing and adding PCI cards for different applications on a single slot.