text: public virtual DescribeCacheParameterGroupsResponse DescribeCacheParameterGroups(DescribeCacheParameterGroupsRequest request){var options = new InvokeOptions();options.RequestMarshaller = DescribeCacheParameterGroupsRequestMarshaller.Instance;options.ResponseUnmarshaller = DescribeCacheParameterGroupsResponseUnmarshaller.Instance;return Invoke<DescribeCacheParameterGroupsResponse>(request, options);}