When an Ad Is to Be Printed in Two Colors,sometimes

Multiple Choice

When an ad is to be printed in two colors,sometimes two separate art boards are made (one for each color) ,and sometimes the second image is glued onto a piece of clear plastic that is placed on top of the first image.The clear plastic is called the:

A) top art.
B) overlay.
C) superimposition.
D) second cover.
E) art wrap.