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The dual of a Boolean expression is obtained by interchanging

  1. Boolean sums and Boolean products
  2. Boolean sums and Boolean products or interchanging $0's$ and $1's$
  3. Boolean sums and Boolean products and interchanging $0's$ and $1's$
  4. Interchanging $0's$ and $1's$
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Boolean duals are generated by simply replacing AND's with OR's , OR's with AND's , ‘1’s with ‘0’s and ‘0’s with ‘1’s. Variables and their complements are left alone. 

Hence,Option(C)Boolean sums and Boolean products and interchanging 0's and 1's.

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