each entry in the current directory contains the symbolic name of a file, together with the index into the array of file descriptors. each descriptor records the file length and the number of the first block on the disk. the block length is 256 bytes. ex: the file named test has a descriptor at index 19, which shows that the file contains 280 bytes. the file starts at disk block 8 and, since the file length exceeds 1 block, the file continues into block 9. the oft keeps track of open files. each entry contains the index into the array of file descriptors and the current position within the file for sequential access. currently, file abc is open. the descriptor index is 16 and the current position is 55, which means the first 55 bytes of the file have already been accessed. for each operation, show all changes to the data structures. (a) open file named test. (b) seek to position 60 of the open test file. (c) create an empty file called new. (d) open file new. (e) write 30 bytes into file new. (f) close file new. (g) delete file new.