public static TranslateOption model(String model) {
      return new TranslateOption(TranslateRpc.Option.MODEL, model);
    }
Sets the language translation model. You can use this parameter to take advantage of Neural
Machine Translation. Possible values are {@code base} and {@code nmt}. Google Translation
could use a different model to translate your text: use {@link Translation#getModel()} to
know which model was used for translation. Please note that you must be whitelisted to use
this option, otherwise translation will fail.

@param model the language translation model
java-translate/google-cloud-translate/src/main/java/com/google/cloud/translate/Translate.java