Given the objects below, write the result for each assignment.

constant v: bit :$=1$;

constant x: std$\_$logic :$=$Z$$;

signal y: bit$\_$vector $(1$ to $4)$;

signal z: std$\_$logic$\_$vector $(7$ downto $0)$;

y $<=($v & $000)$; $--$ result: $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

y $<=$ v & $000$; $--$ result: $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

z $<=($x & x & $11111$ & x$)$; $--$ result: $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

z $<=(0$ & $011111$ & x$)$; $--$ res