There are two four-bit registers, A and B, built out of SR flip-flops. There is a control signal…

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There are two four-bit registers, A and B, built out of SR flip-flops. There is a control signal C. The following operations are needed: If C = 0, send contents of A to B.

If C = 1, send ones complement of contents of A to B. Draw the circuit to perform these functions:

(a) In parallel mode. (b) In serial mode.