To implement sitewide tagging, what do you have to do?

You have to turn off auto-tagging in all your Google Ads accounts that are enabled for sitewide tagging.
You have to make sure Google Click Identifier (GCLID) still works if using click trackers in the URL.
You have to use just the image portion of the JavaScript.
You have to make sure the tag still works by loading it within another tracking tag, like Floodlight.

The correct answer is:

You have to make sure Google Click Identifier (GCLID) still works if using click trackers in the URL.

Sources: Google Ads Measurement Certification Assessment Course

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