6. Given below is a UML class diagram for Staff: Answer all of the following questions that will make use of the defined staff class: a) If you are requested to manipulate a collection of the Staff objects, what is the concept that can be applied to solve the problem? (1 mark) b) Based on your answer in question 6(a), write a statement to declare and create an object to hold 10 number of the Staff objects. (2 marks) c) Based on your answer in question 6(b), write a segment of codes to print the details of all staff objects by invoking a particular method of the staff. class