You work as a Software Developer for ABC Inc. You create a Web service named MyWebService using Visual Studio .NET. You implement a public Web method. You make the method accessible through a Web service application by attaching the WebMethod attribute to the public method. The public method is stored in the class file of the Web service file. When you create a Web service project using the Web service project template, by default, one public method named HelloWorld is created. The HelloWorld public method does not become available through the Web service until you attach the WebMethod attribute. The method must be applied to each method declaration. Now, you want to configure a Web service method. You want to ensure that the Web method performs updates on more than one databases or if the sequence of updates is critical to the overall success of the Web method. Which of the following properties will you use to accomplish this task?