text: public virtual DescribeCacheEngineVersionsResponse DescribeCacheEngineVersions(DescribeCacheEngineVersionsRequest request){var options = new InvokeOptions();options.RequestMarshaller = DescribeCacheEngineVersionsRequestMarshaller.Instance;options.ResponseUnmarshaller = DescribeCacheEngineVersionsResponseUnmarshaller.Instance;return Invoke<DescribeCacheEngineVersionsResponse>(request, options);}