Which of the following laptop or notebook pointing devices looks like an opto-mechanical mouse
turned upside down?

A.
Mouse

B.
Trackball

C.
Touch Screen

D.
Drawing Tablet

Explanation:
A trackball is basically an opto-mechanical mouse turned upside down. Instead of moving the
mouse on a table, you move the track ball. The device otherwise remains stationary.
Incorrect Answers:
A: Your normal computer mouse does not look like an opto-mechanical mouse turned upside
down.
C: Your computer touch screen does not look like an opto-mechanical mouse turned upside down.
D: Your computer drawing tablet does not look like an opto-mechanical mouse turned upside
down.References:David Groth and Dan Newland, A+ Complete Study Guide (2nd Edition), Sybex
Inc, Alameda, CA, 2001, pp. 239