Consider the ALU shown below. If the operands are in 2's complement representation, which of the following operations can be performed by suitably setting the control lines K and C0 only (+ and - denote addition and subtraction respectively) ?

• A. A + B, and A - B, but not A + 1
• B. A + B, and A + 1, but not A - B
• C. A + B, but not A - B, or A + 1
• D. A + B, and A - B, and A + 1