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Que. Which of the following statements are true? 

I. A circuit that adds two bits, producing a sum bit and a carry bit is called half adder.

II. A circuit that adds two bits, producing a sum bit and a carry bit is called full adder.

III. A circuit that adds two bits and a carry bit producing a sum bit and a carry bit is called full adder.

IV. A device that accepts the value of a Boolean variable as input and produces its complement is called an inverter.
a. I & II
b. Il & III
c. I, II, lll
d. I, III & IV
Answer:I, III & IV
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