Richard is creating a dynamic re marketing campaign on the Microsoft Audience Network and is setting the membership duration to 30 days for shopping cart abandoners. What is the minimum number of abandoners needed in this period for the re marketing to work?

The selected answer option, 300 users, is correct because Microsoft Audience Network requires a minimum of 300 users in the specified membership duration for a dynamic remarketing campaign to be effective. This threshold ensures that there is enough data and audience size for the platform to effectively serve dynamic remarketing ads. With a sufficient number of users in the remarketing list, the system can more accurately target and display relevant ads to those users, maximizing the chances of conversion. The other options, such as 1000, 100, and 200 users, do not meet the required minimum threshold for dynamic remarketing to be activated within the Microsoft Audience Network.