To get started with the Microsoft Audience Network, Contoso Snacks will need a minimum of 3 images: a 1200 x 628, a 300 x 250, and a 728 x 90.

False. To get started with the Microsoft Audience Network, Contoso Snacks only needs a minimum of one image. While providing multiple image sizes is recommended for broader reach and better performance across various placements, it is not a strict requirement to begin. The platform can often scale or crop a single image to fit different ad formats, though this may not always result in optimal presentation. Therefore, the statement that three specific image sizes are required is incorrect.