【单选题】
You create 200 new user accounts. The users are located in six different sites.   <br /> New users report that they receive the following error message when they try to log on： "The username or  password is incorrect."  <br /> You confirm that the user accounts exist and are enabled. You also confirm that the user name and  password information supplied are correct.  <br /> You need to identify the cause of the failure. You also need to ensure that the new users are able to log on.  <br /> Which utility should you run（）
A、Rsdiag
B、Rstools
C、Repadmin
D、Active Directory Domains and Trusts
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