Which of the following actions should you take for the World Wide Web Publishing Service to use the tkwebsrv account?

You administer a Microsoft Windows Server 2012 R2 domain named AIOTestking.com. The
AIOTestking.com domain has a server named TESTKING-SR07 that hosts the DNS and Web Server
(IIS) roles.
You create a managed service account named tkwebsrv that will be used by the World Wide Web
Publishing Service. However, when you specify the testking\tkwebsrv account as the logon
account for the World Wide Web Publishing Service, you receive an error message stating “The
account name is invalid or does not exist, or the password is invalid for the account name
specified.”
Which of the following actions should you take for the World Wide Web Publishing Service to use
the tkwebsrv account?

A.
You should delete and recreate the tkwebsrv service account.

B.
You should specify the service account as [email protected].

C.
You should specify the service account as testking\tkwebsrv$.

D.
You should change the password used by the service account.

Explanation:
You must use a dollar sign ($) at the end of the service account name when you are configuring a
service to run under the managed service account.

Reference:
http://technet.microsoft.com/en-us/library/dd548356(v=ws.10).aspx