A $=01000100$

B $=10111011$

$1.$ Assume that A and B are two unsigned binary numbers and an $8-$bit unsigned adder$/$subtractor is used

a$)(5$ points$)$ Give a convincing reason why or why not there will be an overflow when adding these two

numbers $($A$+$B$).$

b$)(5$ points$)$ Give a convincing reason why or why not there will be an overflow when subtracting these two

numbers $($A$-$B$).$