text: public virtual DescribeDBParameterGroupsResponse DescribeDBParameterGroups(DescribeDBParameterGroupsRequest request){var options = new InvokeOptions();options.RequestMarshaller = DescribeDBParameterGroupsRequestMarshaller.Instance;options.ResponseUnmarshaller = DescribeDBParameterGroupsResponseUnmarshaller.Instance;return Invoke<DescribeDBParameterGroupsResponse>(request, options);}