Your network consists of a single Active Directory domain. All servers run Windows Server 2008 R2. You plan to publish a Web site on two Web servers. You need to deploy an availability solution for your Web servers that meets the following requirements： èSupports the addition of more Web servers without interrupting client connections èEnsures that the Web site is accessible even if a single server fails What should you do？（）
- AConfigure a failover cluster.
- BConfigure a Web garden on each Web server.
- CCreate a Network Load Balancing cluster.
- DCreate two application pools on each Web server.