• Avoid linking a Google My Business or Google Merchant Center feed
• Limit the number of ad extensions within an asset group
• Establish conversion tracking after a campaign has been running for two weeks
• Use the maximum number of text, image, and video assets possible

The correct answer is: Use the maximum number of text, image, and video assets possible

Explanation: A best practice to follow when creating a Performance Max campaign is to utilize the maximum number of text, image, and video assets possible. The advantage of this practice lies in the increased potential for ad formats that can be created for different channels and users. More assets typically translate to stronger ad strength, which can further boost the campaign’s performance. Therefore, adding and optimizing asset groups based on ad strength should be a continuous process to enhance a Performance Max campaign’s effectiveness.