The data members of a class can be either private or public - this detail is not one of the most important aspects of defining a class. True False QUESTION 18 What is a method's "signature"? The purpose of the method The interface to the method The name of the method The number of parameters passed to the method QUESTION 19 An array-based implementation of an ADT uses to store the data. an array a list a bag an object QUESTION 20 What is one problem you can have by making your array the largest you would ever need for a possibly expanding and shrinking data set? You could end up wasting space if the data set grows very large but not very often. The dreaded CHUD. The items could end up getting distributed all over the array leaving large gaps between items. The array might run out of room