Create the entity and architecture for the following code

library ieee;

use IEEE.STD$\_$LOGIC$\_1164.$ALL;

use IEEE.NUMERIC$\_$STD$.$ALL;

mux : PROCESS $($sela$,$ selb, a$,$ b$)$

BEGIN

IF $($sela $=\text{'}1\text{'})$ THEN

y $<=$ a;

ELSIF $($selb $=\text{'}1\text{'})$ THEN

y $<=$ b;

END IF;

END PROCESS mux;