Instead of doubling the size of the array, consider tripling the array every time the array is full.i.e: Initially the array has 1 cell, after this is filled up and a new element needs to be inserted, the size will then be expanded to 3. Similarly, after this is filled up and another element needs to be placed, it will now be increased to 9. Assume that each push operation (inserting element) and copy operation (copying element from old array to new array) has a cost of 1 each, what is the approximate average cost of per insertion operation if 81 elements are inserted to the list? (closest to the choices) Select one: a 2.5 b. 15 C. 1 O d. 2 0.3 Assume that each push operation (inserting element) and copy operation (copying element from old array to new array) has a cost of 1 each, what is the approximate average cost of per insertion operation if 82 elements are inserted to the list? (closest to the choices) Select one: a. 1 b.2.5 C.3 d. 2 e. 15 Which of the following graphs best describe the changes in the average cost per insertion? Select one: b. c d