We consider the addition of two 2's compliment numbers bn-1 bn-2 ....b0 and an-1 an-2 ....ao, A binary adder for adding two unsigned binary numbers is used to add two binary numbers. The sum is denoted by cn-1 cn-2 ....c0. The carry out is denoted by Cout. The overflow condition is identified by

• A. \({c_{out}}\left( {\overline {{a_{n - 1}} \oplus {b_{n - 1}}} } \right)\)
• B. \(\overline {{a_{n - 1}}} {b_{n - 1}}\overline {{c_{n - 1}}} + \overline {{a_{n - 1}}{b_{n - 1}}} {c_{n - 1}}\)
• C. \({c_{out}} \oplus {c_{n - 1}}\)
• D. \({a_{n - 1}} \oplus {b_{n - 1}} \oplus {c_{n - 1}}\)