a strip at the edge of a computer screen that you use to scroll through a file with, using a mouse
B.
a list of options that appears on a computer screen when you select an item with a computer mouse
C.
a row of symbols (= icons ) on a computer screen that show the different things that you can do with a particular program
D.
an area that you see along the bottom of the computer screen or window that gives you information about the program that you are using or the document that you are working on