D. all of these, since it depends on how the cell is formatted.
        
                    
             
        
        
        
The answer a. record in the table.
        
             
        
        
        
Well if your talking about physically you could get some compressed air and blow it out. Or if your talking about performance you could try to re-install the os you have on it or replace the hdd with a ssd or higher performance hard disk for it to run like new. :)