A snack food advertiser wants to advertise its newest flavor of pretzels on Pinterest. It is building creative assets for the campaign and wants to make a big impact with an ad format that expands across the full two-column Pinterest feed. Which format should the advertiser use?

The correct answer is Max width video. This format is specifically designed to expand across the full two-column Pinterest feed, providing a highly immersive and impactful visual experience, which aligns with the advertiser's goal of making a "big impact." Lead ads are designed for lead generation, not for expanding across the feed. Standard Pins are single image or video Pins that occupy one column. Carousels display multiple images or videos in a single Pin, but they also occupy only one column in the feed.