【单选题】
A 1) Storage Foundation HA for Windows主备网管均需要安装 Both master and slave EMSs need to install the Storage Foundation HA for Windows.
B 2) Sqlserver2005数据库主备网管均需要安装 Both master and slave EMSs need to install the Sqlserver2005 database.
C 3) NetnumenU31网管软件只需要安装在主网管服务器即可 The NetnumenU31 EMS software only needs to be installed on the master EMS server.
D 4) 配置复制服务只需要在主服务器上进行即可 The duplication service just needs to be configured on the master server
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