A scroll wheel is found on which of the following input devices?
(a)	  
 	
(b)	  
 	
(c)	  
 	
(d)	  
 
A scroll wheel is found on which of the following input devices?
(a)	  
 	
(b)	  
 	
(c)	  
 	
(d)	  
 
A scroll wheel is found on which of the following input devices?
(a)	  
 	
(b)	  
 	
(c)	  
 	
(d)	 