Which Is One Characteristic of the "Accelerated" Delivery Method

Which is one characteristic of the "Accelerated" delivery method?

A) Ads are shown when users search on relevant variations of keywords in the campaign.
B) Ads are only shown when there is a higher likelihood that users will click on them.
C) Ads are shown as frequently as possible until the budget is exhausted.
D) Ads are shown above the search results as well as to the right of the search rest.