For this assignment, you will take the cat program you wrote for the last assignment and upgrade it to add more features. we will call it dog instead of cat, because canines are better than felines. these new features will include: • the ability to specify a command line option (­s x) to change the size of the buffer used for calls to read and write to be x bytes. • the ability to specify a command line option (­n x) to change the number of bytes read from each file to x. (instead of reading the whole file as we would have without this option.) • the ability to specify a command line option (­c x) to have the program apply a caesar cipher with a shift of x to alphabetical characters in the data read before writing its results. • the ability to specify a command line option (­r x) to have the program apply a rotation of x to each byte read from the file before sending the data to be output. • the ability to specify a command line option (­x) to output the data in the file as hexadecimal.