Your network consists of a single Active Directory domain. The network contains two Windows Server 2008 R2 computers named Server1 and Server2. The company has two identical print devices. You plan to deploy print services.  You need to plan a print services infrastructure to meet the following requirements： èManage the print queue from a central location.    èMake the print services available， even if one of the print devices fails. What should you include in your plan？（）