Answer:
The correct answer is letter "D": slots.
Explanation:
Expansion slots are spaces available in the motherboard hardware that allows expanding the capability of some of its components such as the Graphics Processing Unit (GPU) or video card or the Random Access Memory (RAM). There are three main types of expansion slots such as Peripheral Component Interconnect (PCI), PCI Express, and Accelerated Graphics Port (AGP). They take different shapes and sizes.
