What is a collection of components that have defined relationships with each other called?

The correct answer is assembly, which refers to a collection of components that are organized and defined by their relationships with one another. In many design and engineering contexts, an assembly consists of individual parts that come together to form a complete unit, such as a machine, structure, or system. Each component in an assembly has a specific role and contributes to the overall function and interoperability of the final product.

Assemblies are crucial in CAD (Computer-Aided Design) software, where designers can visualize and manipulate each part in conjunction with others. Understanding how these components interact is essential for analyzing design integrity, assembling physical products, and conducting performance simulations.

The other options, although they may imply a relationship among components, don't encompass the same structured and relational aspect as an assembly does. For instance, a module typically refers to a self-contained unit that may not necessarily interact with other components in a defined way, while a cluster often implies a grouping without specifying relationships. A group is more general and can apply to any collection of items, lacking the specificity of defined interactions that an assembly signifies.