Anew class is proposed to collect information about a group of dvds. a separate class containing information about a single dvd, named dvd, has already been created. which of the following is the best design to store the data and size of this collection? a) have an arraylist of dvds and use its size as the size of the collection. b) have an arraylist of dvds and an integer representing the number of dvds in the collection. c) have an array of dvds and use its size as the size of the collection. d) have a single dvd variable representing the last dvd added and an integer representing the number of dvds in the collection.