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Que. Which of the following is not true with respect to a trackball and/or spaceball ?

I. A trackball is a two dimensional positioning device while as a spaceball provides six degrees of freedom.
II. Unlike the trackball a spaceball does not actually move.
Ill. A trackball is a three dimensional positioning device while as a spaceball provides six degrees of freedom.
a. I & II
b. II & III
c. II only
d. III only
Answer:III only
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