Consider an empty stack of integers. Let the numbers 1,2,3,4,5,6 be pushed on to this stack only in the order they appeared from left to right. Let U indicates a push and O indicates a pop operation. Hint: Assume there is an empty Array for the arranged output order and a Stack for the operations. After each POP empty the stack into the array. For example: "UUUUUU000000" is the string of operation outputs of the order "654321" in the rearranged array. Array: 6 5 4 3 2 1 Arranged the output into the order 436521 by giving the order string of operations in "U" and "O". Select the correct string. O a) UOUOOUUOUOOO Ob) UUOOOUUOUOOU Oc) UUOUOUUOUOUO d) UUUUOOUUOOOO