What size does the IAB Rising Star sidekick ad come in?

The IAB Rising Star sidekick ad is designed to be versatile and creative, allowing for multiple dimensions to cater to different advertising needs and placements. This flexibility is important for advertisers looking to engage users in various ways, making it effective across different platforms and devices.

The sidekick format can expand or collapse, depending on the user's interaction, which encourages engagement. By including several sizes, advertisers can choose the dimension that best fits their campaign objectives while ensuring compatibility with various website layouts and user experiences. This adaptability is key in digital advertising, where responsive design is increasingly crucial.

Therefore, the correct answer encompasses all the specified dimensions—300x600, 300x250, and 970x250—highlighting the multi-dimensional approach of the IAB Rising Star sidekick ad. This range enables advertisers to effectively reach their audience through a choice of creative formats, ultimately enhancing the effectiveness of their advertising campaigns.