• 150% of the budget, based on budget segments and KPIs
• 200% of the daily budget, based on inventory
• It’s not a specific percentage, it’s soley based on performance
• 120% of the daily budget, based on the flight dates

The correct answer is: 120% of the daily budget, based on the flight dates

Explanation: Ahead pacing is best if your priority is to spend your entire budget over an entire flight, without risking potentially underspending. This pacing attempts to spend slightly faster than evenly, up to 120% of your prorated spending target. This is done to make sure you’ve spent your entire budget by the end of your flight and is updated in real-time.

Read more here: https://support.google.com/displayvideo/answer/3114676