6. (2 marks) Consider the four-bit adder-subtractor (with overflow detection) shown below. . Adding two positive numbers together (A30 and B3 0) and get a negative number Adding two negative numbers together (A3-1 and B3=1)and you get a positive number In all other circumstances (adding two positives and getting a positive, adding two negatives Verify that the V output bit is correct for the following operations: (S3 1), the V output will be 1 (S3 0), the V output will be 1. and getting a negative, or adding a positive and a negative number), the V output will be 0 Bs A B A B1 Bo Ao C2 FA FA