A full adder can be realised usinga.two half adders, two OR gatesb.two half adders, one OR gatec.one half adder, two OR gatesd.none of these

To realize a full adder, we need to understand its components and their connections.

A full adder is a combinational circuit that adds three input bits: A, B, and a carry-in (Cin), and produces a sum (S) and a carry-out (Cout).

To implement a full adder, we can use either two half adders or one half adder along with additional logic gates.

Option a) suggests using two half adders and two OR gates. This means that we would use one half adder to add A and B, and another half adder to add the sum from the first half adder with the carry-in (Cin). The outputs of the two half adders would then be connected to two OR gates, which would generate the final sum (S) and carry-out (Cout).

Option b) also suggests using two half adders, but with only one OR gate. In this case, we would use one half adder to add A and B, and another half adder to add the sum from the first half adder with the carry-in (Cin). The outputs of the two half adders would then be connected to the single OR gate, which would generate the final sum (S) and carry-out (Cout).

Option c) suggests using only one half adder, but with two OR gates. This means that we would use the half adder to add A and B, and then connect the sum output to one OR gate. The carry-in (Cin) would be connected to the other OR gate. The outputs of the two OR gates would then generate the final sum (S) and carry-out (Cout).

Option d) states that none of these options are correct.

Based on the given options, the correct answer would be either a) or b), as both options describe valid ways to realize a full adder.