Final answer:
The term used for the long-term storage of digital images and documents is 'archive'. So, option A is correct.
Step-by-step explanation:
When it comes to the long-term storage of digital images and documents, the term used is archived. In the past, photographs were chemically recorded on treated glass plates, but today's technology allows images to be recorded electronically and stored on computers.
Modern technology allows for electronic recording and storage, critical for fields like astronomy with CCDs and medical imaging with CT scans. This is critical astronomy as digital sensors, such as charge-coupled devices (CCDs), capture images for detailed studies. Similarly, in medical imaging, technologies like computed tomography (CT scanners) use digital technology to produce sophisticated, highly detailed images that can be stored and analyzed in computers alongside standard X-rays and other diagnostic tools. These stored files can be used for detailed and quantitative studies. For example, astronomers use digital image archives to study celestial objects without needing to look through the telescopes directly.