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The negation of the Boolean expression x...

The negation of the Boolean expression `x harr ~ y` is equivalent to :

A

`(x ^^ y ) vv (~ x ^^ ~ y) `

B

`(x ^^ y) ^^ ( ~ x vv ~y)`

C

`(x ^^ ~y) vv ( ~ x ^^ y)`

D

`(~ x ^^ y) vv (~x ^^ ~y)`

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