Ad Group start time and end time

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#1

Am I assuming right that the Ad Group (Line Item) has no start_time and end_time, so we cannot make Ad Group start at the future date (independent of Campaign?) or set its end before Campaign end?

Does Campaign status govern all the Ad Group statuses to that respect?

If I add an Ad Group few days after the Campaign creation, does that mean that that Ad Group start time is its created_at?