单项选择题

A.Add the following directive to TestPage.aspx. <%@ MasterType VirtualPath="~/TestMaster.master" %> 
B.Add the following directive to TestPage.aspx. <%@ PreviousPageType VirtualPath="~/TestMaster.master" %> 
C.Set the Strict attribute in the @ Master directive of the TestMaster.master page to true. 
D.Set the Explicit attribute in the @ Master directive of the TestMaster.master page to true.