Enumerates the range of selectable scanning resolutions. Format as follows: Each supported resolution is in the format: (m)x(n) where m describes the x dpi resolution along the paper width. n describes the y dpi resolution along the paper length. A scanner that supports several resolutions would enumerate each resolution separated by a comma. A scanner that supports a continuous resolution range would format its range as: (m1-m2)x(n1- n2) where m1 < m2, n1 < n2