URGENT

We have discussed three file allocation techniques for storing a file on disk, namely contiguous allocation, linked allocation, and indexed allocation. For each allocation method show how a file of 12 blocks would be allocated on disk. Note that the disk is represented as 40 blocks with blocks 0, 4, 8,12, 19, 26, 28 already allocated. Note you must show the entire data structure for each allocation method as part of the answer. (3 marks)