The trend in computer systems is toward the use of graphical user interfaces (GUIs). In these operating systems, a trackball is described as—

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a pen-shaped device which allows data to be entered through the CRT screen

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a roller ball which moves the cursor

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a figure which resembles a familiar office device

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an outdated input device

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None of these

1.	The trend in computer systems is toward the use of graphical user interfaces (GUIs). In these operating systems, a trackball is described as—
A.	a roller ball which moves the cursor
B.	a pen-shaped device which allows data to be entered through the CRT screen
C.	a figure which resembles a familiar office device
D.	an outdated input device
E.	None of these
Answer» B. a pen-shaped device which allows data to be entered through the CRT screen

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