Which type of construction is known for being strong, lightweight, and having structural integrity?

The correct answer is unibody configuration. This type of construction provides notable strength and structural integrity due to its design, where the body is made from a single piece of material. This approach helps in distributing stress across the entire structure, reducing weight while maintaining solidity and resilience. Unibody construction is commonly used in automotive design and certain types of buildings, where lightweight materials can contribute to efficiency without compromising strength.

The other choices do not fully represent the combination of lightweight and structural integrity in the same manner. Composite structures generally involve combining different materials, which can benefit a range of properties but may not achieve the same level of cohesiveness as unibody designs. Frame construction relies on individual components to create a whole, which can lead to a heavier final product. Modular design consists of pre-fabricated units that are assembled on-site, and while it offers some benefits, it may not inherently possess the same seamless strength characteristic of unibody structures.