boolean algebra simplification provided equation

Question

i have this one

OM5= NOT ( A OR (B AND C)) OR D

i provided i photo of it. http://i.stack.imgur.com/opS1I.png

I used different calcs that were online and all gave me this result http://www.wolframalpha.com/input/?i=not+(a+or+b%26%26c)+or+d like the wolframalpha one!

But when i did it with my hand i had different results.

the result was NOT(A) AND ( NOT(B) OR NOT(C) OR D )

Answer 1

  NOT ( A OR (B AND C)) OR D
= (NOT A AND NOT (B AND C)) OR D
= (NOT A AND (NOT B OR  NOT C)) OR D
= (NOT A AND NOT B) OR (NOT A AND NOT C) OR D

That's it.