Which option can you use to capture potential business later in the day, even on a limited budget?
Your ad delivery method can determine how long your budget lasts. If your budget is limited, choose a “standard” or “accelerated” ad delivery method to determine the pace you want your ads to show throughout the day. This article outlines the two types of ad delivery methods and when you may want to use them.
Your campaign’s ad delivery method determines how quickly your ads are shown and how long your budget lasts during a given day. Your ad delivery method is relevant if your campaign is limited by budget since it allows you to decide how quickly you want your budget to be spent. If your campaign isn’t limited by budget, the ad delivery method won’t be useful since your budget is high enough to enable your ads to serve throughout the entire day.
Read more here: https://support.google.com/adwords/answer/2404248?hl=en