[3] a Nancy has captured images of her holiday with her camera. The captured images are stored as digital photo files on her camera. Explain how the captured images are converted to digital photo files. [4] b Nancy wants to email photos to Nadia. Many of the photos are very large files, so Nancy needs to reduce their file size as much as possible. Identify which type of file compression would be most suitable for Nancy to use. Explain your choice. [4] ​