Which statement about in-stream video ads is true?

Which statement about in-stream video ads is true?

• A. They are sold only at fixed CPMs
• B. They can be bought on auction and have lower CPM
• C. They can't run on mobile
• D. They require long ad durations

Answer: (B)

In-stream video ads are typically bought through auction-based programmatic channels, meaning impressions are real-time bid on rather than a fixed price. This auction dynamic often leads to lower CPMs because prices reflect immediate supply and demand for each impression. These ads also run across devices, including mobile, and their durations vary by format (some are short bumpers, others longer pre-roll or mid-roll). So the statement that they can be bought on auction and have lower CPM is the best fit. The other ideas—that they’re sold only at fixed CPMs, that they can’t run on mobile, or that they require long ad durations—don’t match how in-stream video ads are typically bought and delivered.