Answer:
Polycarbonate
Step-by-step explanation:
Polycarbonate is a composite material, as it is a type of plastic that is made up of multiple components or materials. Polycarbonate is commonly used in a variety of applications, including automotive parts, electronic components, and bulletproof glass, due to its strength, transparency, and impact resistance.
Aluminum, gold, and silicon, on the other hand, are not composite materials. Aluminum is a metallic element, gold is a precious metal, and silicon is a chemical element. They are all pure substances and not composed of multiple components or materials. However, they can be used in various applications as standalone materials or in combination with other materials to form composites or alloys.