In the original Caesar Cipher, each letter in the message was shifted forward ____ positions.

Each child element may contain children of its own and so forth down the hierarchy, creating a set of ______ elementsthat are all descended from a common parent.

A. descendant B. child C. parent D. sibling

All colors with equal intensities of RGB sub-pixels are either _______, _______, or shades of gray.

Fill in the blank(s) with the appropriate word(s).