4. In an array-based implementation of the ADT list, what is the best case performance of the contains method? a. O(1) b. O(log n) C. O(n) d. O(n) 5. In an array-based implementation of the ADT list, what is the worst case performance of the contains method? a. O(n) b. O(n) C. O(log n) d. 0(1) 6. In an array-based implementation of the ADT list, what is the performance of the contains method when the entry is not in the list? a. O(n) b. O(n?) C. O(log n) d. 0(1)