John's boss asked him to draw a processor's sub$-$circuit. The circuit reads two $32-$bit register values A and B$.$ The same circuit also includes an adder $($A$+$B$),$ subtractor $($A$-$B$),$ bit shift to left by $2($input A$),$ and bit shift to right by $2($input B$).$ The circuit must select one output from the above four operations using a $2-$bit 'selector' signal. Draw the circuit diagram.

Note: The internal operations of these components don't matter. You can draw the adder, subtractor, etc.. as black boxes and simply wire them together.