Questions 12 and 13 please

Question 12 (4 points) Which data structure naturally reverses the order of the data added to it? Singly Linked List Array as a List Queue o Doubly Linked List Regular Array The correct answer is not listed Question 13 (4 points) Saved What OOP concept would you use to specify the types of operations that several objects might want to use, where the objects are not necessarily related? Polymorphism Delegation inheritance The correct answer is not listed concrete classes interfaces abstract classes