The XYZ Computer Company made a commercially-unsuccessful computer which used 19-bit memory words. It used the 2s complement system. It had a single 19-bit register. A display on the operators console showed the contents of the register in hexadecimal. (a) How many hexadecimal digits did the display show? (b) What did the display show when the register contained zero? (c) What did the display show when the register contained the largest possible positive number? (d) What did the display show when the register contained the most negative number possible?