What are the primary lengths, or durations, of video ads? Select all that apply.

The most common and effective video ad lengths are 6, 15, and 30 seconds. Six-second ads are ideal for short, impactful messages, often used as bumper ads. Fifteen-second ads provide a bit more time for storytelling and are frequently seen in pre-roll or mid-roll placements. Thirty-second ads offer a comprehensive opportunity to convey a brand message or product features and are a standard length across many platforms. While 60-second ads exist, they are less common as primary ad durations due to potential viewer drop-off and higher media costs, and are typically reserved for more complex narratives or long-form content.