Review the following statements about creating effective single image ads for digital campaigns. Evaluate each statement to determine if it accurately represents best practices in designing single image ads:
- Statement 1: A single image ad should always include multiple text overlays to provide as much information as possible.
- Statement 2: The image used in a single image ad should be high-resolution and visually striking to immediately capture attention.
- Statement 3: It's effective to use a clear, concise call-to-action in the text overlay or accompanying copy of a single image ad.
- Statement 4: Accompanying copy in a single image ad is unnecessary if the image is self-explanatory.
Identify which statements correctly reflect the principles of effective single image ad design.