Adding image extensions is a key element in optimizing your campaigns for multi-channel success. What is the image size you need to get started?

The selected answer option, 1200 x 628 pixels, is correct because this is the recommended image size for starting with image extensions in Microsoft Advertising campaigns, especially for multi-channel success. This image size is optimized for both desktop and mobile ad placements, providing a visually appealing format that works well across different platforms and devices. The aspect ratio of 1.91:1 ensures the image fits seamlessly within various ad formats, including those in the audience network and display ads. By using this size, advertisers can ensure their ads look professional and attract attention, which is crucial for boosting engagement and enhancing campaign performance across multiple channels. The other options do not adhere to the recommended size and might not provide the same level of optimization for ad performance.