You are tasked with selecting a material for a lightweight bicycle wheel rim based on a given material index that considers strength, density, stiffness, and cost. Use Ashby charts to identify the most suitable material. Given Material Index: Material Index = (Strength / Density) * (Stiffness / Cost) Instructions: 1. Consider the properties of strength, density, stiffness, and cost for selecting a suitable material for a lightweight bicycle wheel rim. 2. Use Ashby charts to analyze the material index and identify the most appropriate material. 3. Justify your material selection based on the information presented on the Ashby charts. 4. Provide a brief explanation of the chosen material's strength, density, stiffness, and cost characteristics.