Please give me correct answer$-$In civil engineering, foundational theories underpin the design and analysis of structures, materials, and systems. These theories encompass principles of mechanics, such as Newton's laws of motion and equilibrium, as well as concepts from fluid mechanics, soil mechanics, and structural analysis. The understanding of stress, strain, and deformation is crucial for designing safe and efficient structures. Additionally, theories related to material properties, such as elasticity and plasticity, inform material selection and structural behavior under various loads. How do these theories integrate with modern computational methods and experimental techniques to advance civil engineering practices and address contemporary challenges in infrastructure design and construction?