A.\(F'\left( x \right) =  - f\left( x \right),\forall \,x \in K.\)                          
B.\(f'\left( x \right) = F\left( x \right),\forall \,x \in K.\)             
C.\(F'\left( x \right) = f\left( x \right),\forall \,x \in K.\)   
D.\(f'\left( x \right) =  - F\left( x \right),\forall \,x \in K.\)

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