Final answer:
The steel-cutting blade is not made of aluminum. It is designed for cutting light sheet metal.
Step-by-step explanation:
The steel-cutting blade is not made of aluminum. It is usually made of materials such as carbide or high-speed steel, which are strong enough to cut through steel. The blade is designed for cutting light sheet metal, which means it is not suitable for cutting windows.
An abrasive-type blade, on the other hand, is used for cutting materials like concrete and masonry, not steel. Therefore, the correct answer is (D) designed for cutting light sheet metal.