The following truth table is most likely from a:

Select Outputs

In| A B | 0 1 2 3

1 | 0 0 | 1 0 0 0

1 | 0 1 | 0 1 0 0

1 | 1 0 | 0 0 1 0

1 | 1 1 | 0 0 0 1

		Full Adder
		Multiplexer
		Parity Checker
		Demultiplexer
		Parity Generator