You must select one of the options. There are three options, as shown in Figure 8.
您必须选择其中之一。
It isn't installed by default, but is available as one of the optional program files, so you must select it during installation (see figure 1).
默认情况下将不安装ADSync，但可以将它用作可选程序文件之一，因此必须在安装过程中选中它(参见图1)。
Because there may be multiple classes defined in the Web service code, you must select only one of them as an interface to the Web service.
因为Web服务代码中可能定义了多个类，所以必须仅选择其中一个作为Web服务的接口。
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