When developing image assets, which of these practices can help drive success?

Providing only square images as a means of maximizing the frequency with which assets can serve
Centering the most important content in the image asset to maximize impact
Selecting images with a white background since these images tend to perform better
Always uploading at least four relevant and unique images at the campaign or ad group level

The correct answer is:

Always uploading at least four relevant and unique images at the campaign or ad group level.