What can you do to optimize in the final week of your campaign’s flight?

Delete any line items that don’t meet your cost-per-action (CPA) goal.
Decrease all of your bids to ensure the best cost per thousand impressions (CPM).
Let auto-optimization handle the last week of the flight.
Make sure that the budget is spent in full on the highest-performing insertion orders.

The correct answer is:

Make sure that the budget is spent in full on the highest-performing insertion orders.