As far as I remember, message-digest functions distill the information contained within a file (small or large) into a single fixed-length<span>number, typically between 128 and 256 bits in length. This function is designed to protect the integrity of a piece of data to define changes to any part of a message.</span>
The union of two tables is basically the total of the two tables, so "or" questions would be my guess.
A. intentionally or recklessly disrupt, degrade, or destroy information or services on the computer
