What is the safest way to connect to Active Directory from DMZ?

I have a DMZ web server hosting the ASP.NET Extranet application. I want users to authenticate in this application using the same user and password that they use in their Windows at work. (we use Active Directory)

I want to know that the best way - the safest way - is to connect from the DMZ web server to Active Directory.

So far I have seen two possibilities:
- RODC
- LDAP over SSL (LDAPS)

Is there any other option you recommend? What other options should I consider? Any restriction or potential problems with any of these solutions?

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