Final answer:
A 2-to-4 decoder is a digital circuit that will have only one active output at a time, corresponding to the binary value of the 2-bit input.
Step-by-step explanation:
A 2-to-4 decoder is a digital logic component that converts a 2-bit binary input into one of four possible outputs. With a 2-to-4 decoder, at any given time, only one of the four outputs will be active (logical '1'), while the others will remain inactive (logical '0').
The active output corresponds to the binary number represented by the inputs. Each input combination selects one of the four output lines. Only one of the output lines will be active or 'high' for each input combination. The active output line corresponds to the binary representation of the input combination.
For example, if the 2-bit input is 00, then the first output would be active, and if the input is 01, then the second output would be active, and so on.