In the add$($T newElement$)$ method in the ArrayBag class, why do we add a new item at the end of the array?

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a

This is required by the specification in the BagInterface

b

It is convenient and efficient to add it there and the interface does not care

c

In fact the new item is not added a the end of the array $--$ it is added in the index to maintain proper ordering of the data