(Soft Update, 4%) The following diagram shows TWO disk blocks (one Directory block and one iNode block) on memory and on hard disk, respectively. The Hard Disk version represents the older values for these two blocks, while the memory version shows the current values. Now, under Delay- write and soft update, we need to write one block (and one block at a time only) from memory back to hard disk. Under this situation, which block should we write back first? Please justify your answer. *** HINT *** as we have a circular dependency situation here, the FIRST block we need to write back is NOT going to be the same as any of the blocks in the memory. Instead, you need to write down the roll -back version of the block (and one of them) -- memory disk DE11 DE11 DE2 (empty) DE3 (empty) (empty) iN(DE3) (empty) (empty) iN(DE2) (empty) iN(DES) (empty) (empty) (empty) Content of the Block to Write back FIRST