Digital cameras are designed to do which of the following?

Digital cameras are specifically designed to capture and input images. This functionality is their primary purpose, enabling users to take photographs and videos by converting light into digital signals that can be stored and processed. They incorporate various components such as lenses, sensors, and image processors to achieve this.

While printing photographs, projecting images, and editing videos are tasks related to photography, they do not fall within the basic function of a digital camera. Printing and projecting typically require additional equipment, such as printers or projectors, while video editing is done using software on a computer or various editing devices. Therefore, the essence of a digital camera's role is centered on capturing visuals, making the first choice the correct answer.