Answer:Event action
Explanation:Event-handling mechanism is the technique through which the  the management of any event is Java is controlled and coordinated. The event handler code is used for the managing of the mechanism and execution.
Event action is not a part of the event handling mechanism in the java because no such step comes under the code of event handler and rest other option are present in java event handler.
 
        
             
        
        
        
Answer:
Basically computer does 5 basic operations that are input, output, process,storing and controlling. Input is basically taking data from the user, processing is transferring that data into useful information, then that information needs to be stored and controlled and finally output is give to user.
 
        
                    
             
        
        
        
Answer:
A proactive computer professional will anticipate future problems and need
Explanation:
This statement is not only true for technology but for any field. Anybody who is proactive will always look for future, will foresee future problems and challenges and get ready to face those. He will simultaneously analyze the present interest and problems and connect the future and prepare himself well to be successful in the future. 
For pro-active person’s success is not an end, even after getting succeeded he must work for tomorrow. So thus, the choice is justified with various analytical statement.