Which of these descriptions captures the best practice for writing effective headlines and descriptions for app campaigns?

For app campaigns, effective headlines should clearly highlight the app's key features to immediately convey its value proposition. This helps users quickly understand what the app does. Description lines then serve to educate and inform potential users further, providing more detail about the app's benefits, functionality, or unique selling points. The other options are less effective because: "Headlines should grab users' attention and description lines should highlight the key features of the app" reverses the primary focus; headlines are better for features, descriptions for detail. "Headlines should state only the name of the app" is too restrictive and misses an opportunity to communicate value. "Headlines should include a call-to-action and description lines should include statistics about the app's popularity" is not the primary best practice; while CTAs can be useful, headlines are better for features, and statistics aren't always the most informative detail for descriptions.