What if we want to detect whether or not overflow occurred as a result of adding two positive

numbers? We can modify our simple $4$ bit adder from before to capture overflow output. Which

of the following diagrams would capture overflow from signed addition of two positive numbers

and two negative numbers? Which would capture overflow from unsigned addition for two

positive numbers? $($See the $4$ diagrams below$)$

#$1$

#$)$

#$4$

$3\mathrm{.}1$ Which of the following diagrams would capture overflow from signed addition of two positive

numbers and two negative numbers?

A$.$ #$1$

B$.$ #$2$

C$.$ #$3$

D$.$ #$4$

$3\mathrm{.}2$ Which would capture overflow from unsigned addition for two positive numbers?

A$.$ #$1$

B$.$ #$2$

C$.$ #$3$

D$.$ #$4$