Question: In the Basic Image Coding Scheme for rectangular raster images on a SIM-ME interface, how are unused bits in the byte representation of an image's raster points handled?
Option 1: Unused bits are set to 0 to minimize storage space.
Option 2: Unused bits are left undefined to allow for future extensions.
Option 3: Unused bits shall be set to 1 as per the coding specification.
Option 4: The handling of unused bits depends on the image's resolution.
Explanation: According to the Basic Image Coding Scheme, to maintain consistency and clarity in the representation of raster images, unused bits within each byte are mandated to be set to 1. This ensures that any unused portions of the byte do not introduce ambiguity or variability in image interpretation across different SIM-ME interfaces.