Two 4-bit binary numbers (1011 and 1111) are applied to a 4-bit parallel adder. The carry input is 1. What are the values for the sum and carry output?

• ∑4∑3∑2∑1 = 0111, Cout = 0
• ∑4∑3∑2∑1 = 1111, Cout = 1
• ∑4∑3∑2∑1 = 1011, Cout = 1
• ∑4∑3∑2∑1 = 1100, Cout = 1