(A) After a new campaign is launched.
(B) After the campaign is set up with automated bidding.
(C) After the campaign ends.
(D) After three weeks of manual and automated optimizations.
Campaigns need to be optimized until they are over so you should stop optimizing a campaign only after the campaign ends.
This question is from the Make it Stick section of the “Keeping optimized campaigns optimized” lesson from the Optimize your Display & Video 360 campaign course.