The slogan "You press the button, we do the rest" was highly appropriate for Kodak because it emphasized the convenience and simplicity of their product. Kodak designed its cameras to be easy to use, with a focus on the consumer experience. The correct answer to your question is:
Kodak cameras came with film inside; when an individual had finished the film, the entire camera was sent to Kodak for processing, and the camera and negative images were sent back.
This encapsulates the essence of the slogan: the consumer only needed to take the picture, while Kodak handled the more technical and complex aspects of film development and processing. This made photography accessible to the masses, allowing people to capture moments without needing to understand the intricacies of photography or film processing.