You attach a printer to a four port unpowered USB hub that is connected to a notebook. However,
you cannot print to the printer. What is the cause of this problem?

A.
The printer drivers are not installed properly.

B.
The printer has no USB cable.

C.
The printer cartridge needs to be purged.

D.
The portable printer requires more power than is available through the USB hub.

Explanation:
Some USB devices needs more power than an unpowered USB hub can provide by drawing
power from the host PC and especially not if the host is a portable with a reduced power output to
the USB ports.