The disadvantage(s) of using an ArrayList instead of an array include: a. an Array List is less efficient than an array b. an Array List doesn't use an intuitive notation such as square brackets to access elements C. an ArrayList cannot store data elements of a primitive type d. all of the above An interface may contain: a. private variables b. global variables c. final variables (constants) d. instance variables Marking the Node class private in a linked list data structure is an example of a. inheritance b. encapsulation c. polymorphism d. abstraction