The figure below illustrates Contiguous Allocation of disk space. Assume the blocks are allocated the same on the disk for Linked and Indexed. Assume that the file-control block (and the index block, in the case of indexed allocation) is already in memory. Also assume that the block information to be added is stored in memory. How many disk I O operations are required to add 1 block for file "list" at the end for contiguous, linked, and indexed (single-level) allocation strategies? Draw the directory of your updated "list" for each allocation case. Also show the content of the Index Block (size of 8 entries) Contiguous Allocation Linked Allocation Indexed Allocation directory file start length count tr mail list count 2 3 6 19 28 6 tr 2 12131415 16171819 mail 2021 2223 242526 27 list 28 293031