code: def ask_backend(self):
          
          response = self._ask_boolean(
              "Do you have a local docker daemon (on Linux), do you use docker-machine via a local machine, or do you use "
              "Docker for macOS?", True)
          if (response):
              self._display_info("If you use docker-machine on macOS, please see "
                                 "http://inginious.readthedocs.io/en/latest/install_doc/troubleshooting.html")
              return "local"
          else:
              self._display_info(
                  "You will have to run inginious-backend and inginious-agent yourself. Please run the commands without argument "
                  "and/or read the documentation for more info")
              return self._display_question("Please enter the address of your backend")
docs: Ask the user to choose the backend