Before purchasing a new video card for a PC, which of the following should be checked to ensure there will be enough electricity for the video card to function properly?

GPU (Graphics Processing Unit) is the processing chip on the video card itself, not the power source for the computer.

CPU (Central Processing Unit) is the main processor of the computer but does not supply electrical power to other components.

GUI (Graphical User Interface) refers to the visual operating system interface and is irrelevant to the electrical power supply for hardware.

The Power Supply Unit (PSU) is responsible for converting wall outlet AC power into the DC power required by all internal computer components, including the often power-hungry video card, so its wattage capacity must match or exceed the system's needs.