Correct Answer : Option (A) :   Adders

Explanation : The basic building blocks of the arithmetic unit in digital computers are known as adders. Adder is the Arithmetic mathematical function derived out of Logic gates. So, Adder always plays a major role in understanding Digital Electronics. The simplest but the most powerful application of logic gates is Adder. A full adder is similar to a half adder except that instead of 2 inputs and two outputs, there are now three inputs and two outputs. The inputs are carry-in (Cin), X, and Y. Your outputs remain the same, sum, and carry-out (Cout).

A half adder is typically only useful for "single digit" addition. A full adder implements the half Adder to link multiple full adders together to achieve higher orders of addition. Sixteen full adders in the group allow 16- bit addition.