Select and write the correct answer from...

Select and write the correct answer from the given alternatives in each of the following:which o fthe following is incorrect?

A

`(A+B+……….+Z)'=A'+B'+……..+Z'`

B

`(AB…….Z)'=A'B'…………Z'`

C

`(KA)'=KA'`

D

`(A')'=A`

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