which of the following is used so a reader can understand the symbols used in the sketch?\nscale\ncompass\nno…

Brief Explanations:

A legend in a sketch or drawing lists and explains the symbols used, helping the reader understand what each symbol represents. A scale is for representing real - world sizes, a compass is a drawing tool, and notation is more about written symbols in a general context like music or math, not specifically for sketch symbols.

Answer:

D. Legend