问题：

[单选]

Company.com network consists of a single Active Directory domain named 
Company.com.Company.com has an Exchange Server 2010 organization.The Company.com employees use Microsoft Office Outlook 2007 to connect to their mailboxes.RPC over HTTP and Auto discover are configured on Microsoft Office Outlook 2007. A new Company.com security policy requires that the employees connected to the domain does not need authentication when using Outlook Anywhere.However， those not connected t the domain needs to be authentication when using Outlook Anywhere.The employees need to comply with the new Company.com security policy. 
What should you do？（）

A . You should consider using Basic authentication on Outlook Anywhere and set up only Basic authentication on the RPC virtual directory.
B . You should consider using NTLM authentication on Outlook Anywhere and set up Basic authentication and NTLM authentication on the RPC virtual directory.
C . You should consider using NTLM authentication on Outlook Anywhere and set up only Basic authentication on the RPC virtual directory.
D . You should consider using Basic authentication on Outlook Anywhere and set up Basic authentication and NTLM authentication on the RPC virtual directory.