text: public virtual RegisterTransitGatewayMulticastGroupSourcesResponse RegisterTransitGatewayMulticastGroupSources(RegisterTransitGatewayMulticastGroupSourcesRequest request){var options = new InvokeOptions();options.RequestMarshaller = RegisterTransitGatewayMulticastGroupSourcesRequestMarshaller.Instance;options.ResponseUnmarshaller = RegisterTransitGatewayMulticastGroupSourcesResponseUnmarshaller.Instance;return Invoke<RegisterTransitGatewayMulticastGroupSourcesResponse>(request, options);}