Multiplexer using Universal Gates

A multiplexer using basic gates is shown in the figure given image002. If A = B = 11 and D0 D1 D2 D3 = 1001, then the output of the circuit is:
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What if the select inputs in image002are set to A = B = 0 1 and the data inputs are set to D0 D1 D2 D3 = 0100? The output Y is:
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How many select lines are required for a 4: 1 Mux?
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Any multiplexer can be designed using universal logic gates. State True or False.
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