Which ad tag should be used for 3rd party ad server (DFP)

For maximum transparency and efficiency in monetization when delivering ads thru DFP or any 3rd party ad server, publisher shall use Javascript Synchronous tag that is available under Inventory section in profile, first selection in drop-down menu. It will not affect page load since DFP or 3rd party Ad Server is already using Asynchronous ad tag to deliver RITS Ads.