Which of the following circuits come under the class of

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Which of the following circuits come under the class of combinational logic circuits:
1. Full adder
2. Full subtractor
3. Half adder
4. J-K flip-flop
5. Counter
Select the correct answer from the codes given below—

1. 1 only
2. 3 and 4
3. 4 and 5
4. 1, 2 and 3

Correct Option: D

Combinational logic circuit are:
● Full adder
● Full subtractor
● Half adder