Which Truth Tables among these 6 appear to be Z E R O - p r e s e r v i n g boolean functions ?

check every ZERO-preserving function :

Question

Which    Truth  Tables    among  these  6  appear  to be     Z E R O - p r e s e r v i n g      boolean  functions ? 
  
 check  every     ZERO-preserving   function   :

Answer

4th    function   is    ZERO-preserving   ?

Answer

5th    function   is    ZERO-preserving   ?

Answer

6th    function   is    ZERO-preserving   ?

Answer

2nd    function   is    ZERO-preserving   ?

Answer

3rd    function   is    ZERO-preserving   ?

Answer

1st    function   is    ZERO-preserving   ?

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Which Truth Tables among these 6 appear to be Z E R O - p r e s e...

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