A) Write a small C program that copies data from a file A to a file B byte-by-byte. For different file sizes 1MB - 128MB (doubling the file size in each step), record the time your program requires to complete the file copy when using read() and write() system calls. Generate a graph that depicts the program performance. Use the Unix time(1) command. B) Repeat this experiment, but instead of copying individual bytes, use larger size portions of the file that are copied in each read() and write() system call. For instance, you may choose to copy the file in chunks of 2, 4, 8, ..., 1024 byte units. Use a 128MB file for each test. Generate a performance graph of transfer size vs execution time and interpret your experimental results. What do you observe? Why do you think the system shows the observed behavior? Note: For these programs, it is imperative that file A and file B are located on the local disk. On Linux, the /tmp directory is located on the local file system. You must submit your program, the graphs of the corresponding experiments, and your analysis. Failure to follow this direction will invalidate your results as your home directory is on a network mounted drive and I/O times are influenced by network load.