Which of the following is considered a best practice when creating effective image assets?

Keep the most important content in the center 50% of the image asset.
Only provide square images to maximize how often assets can serve.
Always upload four or more relevant and unique images at the campaign or ad group level.
Choose images with a white background as they tend to have stronger performance.

The correct answer is:

Always upload four or more relevant and unique images at the campaign or ad group level.