Please answer all the questions

What data type you need to use to declare complex numbers? a. Integer b. Abstract Data Type c. Double d. String How many comparisons it will take to sort the following array using bubble sort? 2 9 8 4 10 1 3 a. 7 b.45 c. 15 d. 21 What check should be performed before Pop from the stack? a. The stack is not full b. The stack is not empty The stack is full d. The stack is empty What is the best data structure that can be used to implement the customer service in a bank? a. Stack b. Array c Linked List d. Queue Which data structure uses LIFO is as a method to insert and remove elements? a. Array b. Stack cLinked List d. Queue If a linked list is used to implement a Stack, which method in the linked list will be used to pop0 elements? a. Delete At First b. Delete At Last c. InsertAt First d. InsertAtLast Which one of the followings is correct about ordered arrays? a. Insertion is the same as un ordered array. b. Search is the same as un ordered array. c. Deletion is the same as un ordered array. d. None of the above. Which one of the following data structures allows random access to its elements? a. Stack b. Linked List c. Queue d. Array