Suppose that you have a UNIX file system where the disk block size is 1000 bytes.

If a file has 50,000 bytes of data and it is never been accessed, we only assume the i-node is in memory, none of the rest of the file the user wants to access to 1600 bytes of data from address 8,500, how many I/O operations would be needed?

A. 1 B. 2 C. 3 D. 4 E. 5 F.6