[多选] Which of the following three port types are valid Spanning Tree port types？（Choose the best threeanswers.）（）

锢囚锋 变额人寿保险 You are creating a Windows Communication Foundation (WCF) service. The service endpoints change frequently. On the service, you add a new ServiceDiscoveryBehavior to the Behaviors collection of the ServiceHost Description property. You need to ensure that client applications can communicate with the service and discover changes to the service endpoints. What should you do?（） Add a new ServiceDiscoveryBehavior to the Behaviors collection in the client application.。 Add a new AnnouncementClient to the Behaviors collection in the client application.。 Use the FindCriteria class and the UdpDiscoveryEndpoint class to set up the binding in the client application.。 Use the DiscoveryProxy class and the EndpointDiscoveryMetadata class to set up the binding in the client application.。 沙门思潮 “动作”是DW预先编写好的（）脚本程序，通过在网页中执行这段代码就可以完成相应的任务。  VBScript。  JavaScript。  C++。  JSP。 Which of the following three port types are valid Spanning Tree port types？（Choose the best threeanswers.）（）