What is the fixed frame dimension for the IAB Rising Star portrait ad?

The fixed frame dimension for the IAB Rising Star portrait ad is 300x1050. This size is specifically designed for engaging and visually impactful ads that maintain a tall, narrow format, which is ideal for mobile and desktop devices. The Rising Star ad formats are intended to offer enhanced user experiences by allowing for more creative and interactive content.

In contrast, the other options represent dimensions of different ad formats. For instance, 970x250 refers to a large leaderboard format often used at the top of web pages, while 300x600 is known as a half-page ad that allows for considerable visual space but does not fit the portrait specification. The dimension 300x3000 is not a standard size recognized by the IAB. Thus, the 300x1050 dimension aligns perfectly with the requirements of the Rising Star portrait format, making it the correct choice.