form page shared above: "A dynamic block acts much like a for expression, but produces nested blocks instead of a complex typed value. It iterates over a given complex value, and generates a nested block for each element of that complex value." "The for_each argument provides the complex value to iterate over." To me this says "D" is correct

The dynamic block in Terraform is used to construct nested configuration blocks dynamically based on a collection of values, such as a list or a map. This block type allows you to create multiple instances of the same resource or module, without having to duplicate the configuration code. The for_each argument is used with the dynamic block to specify the collection of values to iterate over. The content block inside the dynamic block is used to define the configuration for each iteration.