Which of the following choices best describes a useful feature of delivery reports?

The best choice that describes a useful feature of delivery reports is focused on ensuring that all ads are placed correctly. Delivery reports provide critical information on how ads are being delivered in terms of reach, impressions, and placements. This capability allows marketers to verify that their ads are shown to the intended audience and on the appropriate platforms.

Accurate ad placement is essential for the effectiveness of a campaign, as improper placements can lead to wasted ad spend and diminished performance. By analyzing delivery reports, marketers can identify any discrepancies in ad placements and make the necessary adjustments to optimize campaign performance.

While insights for new strategies, increasing bids, and audience demographics are important aspects of digital marketing, they are not the primary focus of what delivery reports provide. Instead, delivery reports are specifically designed to track and validate the execution of ad placements, making option D the most relevant and correct choice.