Which of the following statements about macros is correct?

The statement that all analytical apps must contain at least one macro is correct. This is because macros are fundamental components of analytical apps, allowing users to encapsulate complex processes or customized functionality into a single tool that can be reused throughout a workflow. By incorporating macros, analysts can create more streamlined and efficient applications, increase their productivity, and ensure consistency across processes.

The other statements present limitations that do not accurately represent the capabilities of macros in Alteryx. For instance, macros can indeed be used multiple times within a single workflow, offering flexibility to the user. Additionally, once a macro is created, it can be edited to refine its functionality or address any needed adjustments. Lastly, while macros can utilize various tools, there are certain considerations depending on the complexity of the macro and its intended use which may impose some restrictions. However, this does not suggest there are absolute restrictions on the tools that can be used.