The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits:

The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits: 

(1) Increase ripple delay (2) Add a 1 to complemented inputs (3) Reduce propagation delay (4) Determine sign and magnitude
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Answer :

The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits: Reduce propagation delay.

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