Discussion
................. is an example of a combinational circuit.
Answer: D
Multiplexers are combinational circuits.
A combinational circuit's output depends only on its present inputs. A multiplexer simply routes one of its data inputs to the output according to the select inputs, with no memory, so it is combinational. Adders, decoders, encoders and comparators are other examples.
Shift registers, counters and flip-flops are sequential circuits: their outputs depend on stored state as well as on present inputs, and flip-flops are the memory elements from which registers and counters are built.
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