Zero-touch provisioning (ZTP) is the method that allows network devices to be provisioned and configured automatically, requiring no manual intervention. When the device is connected to the network, it obtains its configuration from a server based on predefined policies and the process runs to completion, making it the best choice for the listed scenario. Manual configuration would necessitate an administrator to configure each device by hand, which is time-consuming and error-prone. Pre-provisioning assumes configurations are set before the device is connected, which is not truly 'zero-touch'. Lastly, dynamic configuration refers to continually adapting the configuration, which does not address the automated initial setup.