A method of transformation that involves changing the radix or base of the original key and either discarding excess high-order digits (that is, digits in excess of the number desired in the key) or extracting some part of the transformed number.
The question is asking to choose among the following choices that state what would the domain in an email represents, base on my research, I would say that the answer would be letter B. location of the destination. I hope you are satisfied with my answer and feel free to ask for more