Hello there I need the answers to few of these questions # 6,9,11,17,18,20,21

6. Which of the following assertions is true? An array cannot be sized dynamically. An array can be sized dynamically, but cannot be resized with out instantiating it again An array can be sized dynamically and can also be resized without instantiating it again. 7. How do you retrieve the number of elements in an array a? a.length ( ) a.length a.size ( ) a.size 8. All the elnests of an array must be of the same type. 9. Array aggregate assignment is possible in Java. true false