Question: WHY IS ( A + B + C + D ) ' = ABCD? i dont get it is that A'B'C'D'?? IN MY PPT THE

WHY IS (A+B+C+D)'= ABCD? i dont get it is that A'B'C'D'?? IN MY PPT THE ANSWER IS ABCD.... I JUST FOLLOW DMORGAN THEOREM.. THIS IS LOGIC OPERATION
[A AND B]
[C AND D]
A.B NAND C.D IT'S ANSWER IS A+B+C+D..
IS THAT A'+B'+C'+D"? CUZ DMORGAN THEOREM..

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