4. (20 points) The XYZ Computer Company made a commercially-unsuccessful computer which used 17-bit memory words. It used the 2's complement system (a) Consider the largest positive number that could be stored in a word (i) (5 points) Express it in octal (ii) (5 point) Express it in hexadecimal Consider the most negative number that could be stored in a word (ii) (5 points) Express it in octal (iv) (5 points) Express it in hexadecimal (b)