13. Create a one-bit wide, 2-to-1 multiplexer. When sel=0, choose a. When sel=1, choose b. 14. Create a 100-bit wide, 2-to-1 multiplexer. When sel=0, choose a. When sel=1, choose b. 15. Create a 16-bit wide, 9-to-1 multiplexer. sel=0 chooses a, sel=1 chooses b, etc. For the unused cases (sel=9 to 15), set all output bits to '1'.